Go to the tutorials page and find mariokart64n's topic.  The tutorials are at the top of the help section.

I'm pretty sure you can't.  If I remember right the code was made only for the sd slot.  If you want to use a usb though you can try replacing the files on the iso and then play the game in usb loader.  Just make sure you keep a backup of the iso so you can go back if you ever need to.  You need an 8g flash drive to do it though.

Eww.... Use mariokart64n's method.  Its way better.
http://forums.kc-mm.com/index.php?topic=8577.0

What file replacement code are you using?

what is the size of your sd?  if it's over 2g it wont work for brawl.

are you talking about on the character select screen or during matches?

ok my bad... 
private/wii/app/RSBE/pf/toy/fig/...

trophies work the same way as normal textures

private/wii/app/RSBE/pf/item/lin//AsfLinBrres.pac

Trophies are in toy/fig/...
Lin is in item/lin/AsfLinBrres.pac

Did you know that there is a PSA help section?

Alright thanks.  Start small before the big leagues right?

I've decided I wanted to learn how to to make stages but from scratch kinda like how the kcmm club stage is here and stuff like that.  I can figure out how to do my own animations and stuff but I would really appreciate it if someone could tell me how to make a custom stage from scratch because I looked and I couldn't really find anything at all on it.  All I found was how to alter the stage collisions.

[FitGameWatch00]

Major bump, but I do have an image to show, in terms of the character color slots.  It'll help people with the texture replacing accuracy.

Note: The following image is quite big in height, which is why it's in a spoiler box.

Note: Mr. G&W only has one texture slot, which is FitGameWatch00.  However, his CLR0 data does work in the same manner as the texture slot numbers...

00 - Default
01 - Red
02 - Green
03 - Blue
04 - Extra 1
05 - Extra 2
06 - Extra 3 (not used)

Oh hello picture version of my list

Hey here's something you can add to the guide for people who can't seem to figure it out.  Its a list I made that corresponds every csp with it's file.

Code:

Mario
MenSelchrFaceB.001 - FitMario00
MenSelchrFaceB.002 - FitMario06
MenSelchrFaceB.003 - FitMario03
MenSelchrFaceB.004 - FitMario04
MenSelchrFaceB.005 - FitMario05
MenSelchrFaceB.006 - FitMario02

Donkey Kong
MenSelchrFaceB.011 - FitDonkey00
MenSelchrFaceB.012 - FitDonkey04
MenSelchrFaceB.013 - FitDonkey01
MenSelchrFaceB.014 - FitDonkey03
MenSelchrFaceB.015 - FitDonkey02
MenSelchrFaceB.016 - FitDonkey05

Link
MenSelchrFaceB.021 - FitLink00
MenSelchrFaceB.022 - FitLink01
MenSelchrFaceB.023 - FitLink03
MenSelchrFaceB.024 - FitLink05
MenSelchrFaceB.025 - FitLink06
MenSelchrFaceB.026 - FitLink04

Samus
MenSelchrFaceB.031 - FitSamus00
MenSelchrFaceB.032 - FitSamus03
MenSelchrFaceB.033 - FitSamus01
MenSelchrFaceB.034 - FitSamus05
MenSelchrFaceB.035 - FitSamus04
MenSelchrFaceB.036 - FitSamus02

Yoshi
MenSelchrFaceB.041 - FitYoshi00
MenSelchrFaceB.042 - FitYoshi01
MenSelchrFaceB.043 - FitYoshi03
MenSelchrFaceB.044 - FitYoshi04
MenSelchrFaceB.045 - FitYoshi05
MenSelchrFaceB.046 - FitYoshi06

Kirby
MenSelchrFaceB.051 - FitKirby00
MenSelchrFaceB.052 - FitKirby04
MenSelchrFaceB.053 - FitKirby03
MenSelchrFaceB.054 - FitKirby01
MenSelchrFaceB.055 - FitKirby02
MenSelchrFaceB.056 - FitKirby05

Fox
MenSelchrFaceB.061 - FitFox00
MenSelchrFaceB.062 - FitFox04
MenSelchrFaceB.063 - FitFox01
MenSelchrFaceB.064 - FitFox02
MenSelchrFaceB.065 - FitFox03
MenSelchrFaceB.066 - FitFox05

Pikachu
MenSelchrFaceB.071 - FitPikachu00
MenSelchrFaceB.072 - FitPikachu01
MenSelchrFaceB.073 - FitPikachu02
MenSelchrFaceB.074 - FitPikachu03

Luigi
MenSelchrFaceB.081 - FitLuigi00
MenSelchrFaceB.082 - FitLuigi05
MenSelchrFaceB.083 - FitLuigi01
MenSelchrFaceB.084 - FitLuigi03
MenSelchrFaceB.085 - FitLuigi04
MenSelchrFaceB.086 - FitLuigi06

Captain Falcon
MenSelchrFaceB.091 - FitCaptain00
MenSelchrFaceB.092 - FitCaptain04
MenSelchrFaceB.093 - FitCaptain01
MenSelchrFaceB.094 - FitCaptain02
MenSelchrFaceB.095 - FitCaptain03
MenSelchrFaceB.096 - FitCaptain05

Ness
MenSelchrFaceB.101 - FitNess00
MenSelchrFaceB.102 - FitNess05
MenSelchrFaceB.103 - FitNess04
MenSelchrFaceB.104 - FitNess02
MenSelchrFaceB.105 - FitNess03
MenSelchrFaceB.106 - FitNess06

Bowswer
MenSelchrFaceB.111 - FitKoopa00
MenSelchrFaceB.112 - FitKoopa04
MenSelchrFaceB.113 - FitKoopa01
MenSelchrFaceB.114 - FitKoopa03
MenSelchrFaceB.115 - FitKoopa05
MenSelchrFaceB.116 - FitKoopa06

Peach
MenSelchrFaceB.121 - FitPeach00
MenSelchrFaceB.122 - FitPeach05
MenSelchrFaceB.123 - FitPeach01
MenSelchrFaceB.124 - FitPeach03
MenSelchrFaceB.125 - FitPeach02
MenSelchrFaceB.126 - FitPeach04

Zelda
MenSelchrFaceB.131 - FitZelda00
MenSelchrFaceB.132 - FitZelda01
MenSelchrFaceB.133 - FitZelda03
MenSelchrFaceB.134 - FitZelda05
MenSelchrFaceB.135 - FitZelda02
MenSelchrFaceB.136 - FitZelda04

Sheik
MenSelchrFaceB.141 - FitSheik00
MenSelchrFaceB.142 - FitSheik01
MenSelchrFaceB.143 - FitSheik03
MenSelchrFaceB.144 - FitSheik05
MenSelchrFaceB.145 - FitSheik02
MenSelchrFaceB.146 - FitSheik04

Ice Climbers
MenSelchrFaceB.151 - FitPopo00
MenSelchrFaceB.152 - FitPopo01
MenSelchrFaceB.153 - FitPopo03
MenSelchrFaceB.154 - FitPopo04
MenSelchrFaceB.155 - FitPopo02
MenSelchrFaceB.156 - FitPopo05

Marth
MenSelchrFaceB.161 - FitMarth00
MenSelchrFaceB.162 - FitMarth01
MenSelchrFaceB.163 - FitMarth02
MenSelchrFaceB.164 - FitMarth04
MenSelchrFaceB.165 - FitMarth05
MenSelchrFaceB.166 - FitMarth03

Mr. Game&Watch
MenSelchrFaceB.171-176 - FitGameWatch00

Falco
MenSelchrFaceB.181 - FitFalco00
MenSelchrFaceB.182 - FitFalco05
MenSelchrFaceB.183 - FitFalco03
MenSelchrFaceB.184 - FitFalco01
MenSelchrFaceB.185 - FitFalco02
MenSelchrFaceB.186 - FitFalco04

Ganondorf
MenSelchrFaceB.191 - FitGanon00
MenSelchrFaceB.192 - FitGanon04
MenSelchrFaceB.193 - FitGanon03
MenSelchrFaceB.194 - FitGanon02
MenSelchrFaceB.195 - FitGanon01
MenSelchrFaceB.196 - FitGanon05

Meta Knight
MenSelchrFaceB.211 - FitMetaKnight00
MenSelchrFaceB.212 - FitMetaKnight04
MenSelchrFaceB.213 - FitMetaKnight01
MenSelchrFaceB.214 - FitMetaKnight02
MenSelchrFaceB.215 - FitMetaKnight03
MenSelchrFaceB.216 - FitMetaKnight05

Pit
MenSelchrFaceB.221 - FitPit00
MenSelchrFaceB.222 - FitPit04
MenSelchrFaceB.223 - FitPit01
MenSelchrFaceB.224 - FitPit02
MenSelchrFaceB.225 - FitPit03
MenSelchrFaceB.226 - FitPit05

Zero Suit Samus
MenSelchrFaceB.231 - FitSZeroSuit00
MenSelchrFaceB.232 - FitSZeroSuit03
MenSelchrFaceB.233 - FitSZeroSuit01
MenSelchrFaceB.234 - FitSZeroSuit05
MenSelchrFaceB.235 - FitSZeroSuit04
MenSelchrFaceB.236 - FitSZeroSuit02

Captain Olimar
MenSelchrFaceB.241 - FitPikmin00
MenSelchrFaceB.242 - FitPikmin04
MenSelchrFaceB.243 - FitPikmin01
MenSelchrFaceB.244 - FitPikmin05
MenSelchrFaceB.245 - FitPikmin02
MenSelchrFaceB.246 - FitPikmin03

Lucas
MenSelchrFaceB.251 - FitLucas00
MenSelchrFaceB.252 - FitLucas04
MenSelchrFaceB.253 - FitLucas01
MenSelchrFaceB.254 - FitLucas03
MenSelchrFaceB.255 - FitLucas02
MenSelchrFaceB.256 - FitLucas05

Diddy Kong
MenSelchrFaceB.261 - FitDiddy00
MenSelchrFaceB.262 - FitDiddy05
MenSelchrFaceB.263 - FitDiddy04
MenSelchrFaceB.264 - FitDiddy06
MenSelchrFaceB.265 - FitDiddy02
MenSelchrFaceB.266 - FitDiddy03

Pokemon Trainer
MenSelchrFaceB.271 - FitPokeTrainer00
MenSelchrFaceB.272 - FitPokeTrainer01
MenSelchrFaceB.273 - FitPokeTrainer02
MenSelchrFaceB.274 - FitPokeTrainer03
MenSelchrFaceB.275 - FitPokeTrainer04

Charizard
MenSelchrFaceB.281-285 - See 271-275

Squirtle
MenSelchrFaceB.291-295 - See 271-275

Ivysaur
MenSelchrFaceB.301-305 - See 271-275

King Dedede
MenSelchrFaceB.311 - FitDedede00
MenSelchrFaceB.312 - FitDedede06
MenSelchrFaceB.313 - FitDedede02
MenSelchrFaceB.314 - FitDedede05
MenSelchrFaceB.315 - FitDedede03
MenSelchrFaceB.316 - FitDedede04

Lucario
MenSelchrFaceB.321 - FitLucario00
MenSelchrFaceB.322 - FitLucario01
MenSelchrFaceB.323 - FitLucario04
MenSelchrFaceB.324 - FitLucario05
MenSelchrFaceB.325 - FitLucario02

Ike
MenSelchrFaceB.331 - FitIke00
MenSelchrFaceB.332 - FitIke05
MenSelchrFaceB.333 - FitIke04
MenSelchrFaceB.334 - FitIke03
MenSelchrFaceB.335 - FitIke02
MenSelchrFaceB.336 - FitIke01

R.O.B.
MenSelchrFaceB.341 - FitRobot00
MenSelchrFaceB.342 - FitRobot06
MenSelchrFaceB.343 - FitRobot05
MenSelchrFaceB.344 - FitRobot04
MenSelchrFaceB.345 - FitRobot03
MenSelchrFaceB.346 - FitRobot02

Jigglypuff
MenSelchrFaceB.361 - FitPurin00
MenSelchrFaceB.362 - FitPurin01
MenSelchrFaceB.363 - FitPurin04
MenSelchrFaceB.364 - FitPurin03
MenSelchrFaceB.365 - FitPurin02

Wario
MenSelchrFaceB.371 - FitWario00
MenSelchrFaceB.372 - FitWario01
MenSelchrFaceB.373 - FitWario05
MenSelchrFaceB.374 - FitWario02
MenSelchrFaceB.375 - FitWario04
MenSelchrFaceB.376 - FitWario03
MenSelchrFaceB.377 - FitWario06
MenSelchrFaceB.378 - FitWario07
MenSelchrFaceB.379 - FitWario09
MenSelchrFaceB.380 - FitWario08
MenSelchrFaceB.381 - FitWario10
MenSelchrFaceB.382 - FitWario11

Toon Link
MenSelchrFaceB.401 - FitToonLink00
MenSelchrFaceB.402 - FitToonLink01
MenSelchrFaceB.403 - FitToonLink03
MenSelchrFaceB.404 - FitToonLink04
MenSelchrFaceB.405 - FitToonLink05
MenSelchrFaceB.406 - FitToonLink06

MenSelchrFaceB.411-416 - Blank

Wolf
MenSelchrFaceB.431 - FitWolf00
MenSelchrFaceB.432 - FitWolf01
MenSelchrFaceB.433 - FitWolf04
MenSelchrFaceB.434 - FitWolf02
MenSelchrFaceB.435 - FitWolf03
MenSelchrFaceB.436 - FitWolf05

Snake
MenSelchrFaceB.451 - FitSnake00
MenSelchrFaceB.452 - FitSnake01
MenSelchrFaceB.453 - FitSnake03
MenSelchrFaceB.454 - FitSnake04
MenSelchrFaceB.455 - FitSnake02
MenSelchrFaceB.456 - FitSnake05

Sonic
MenSelchrFaceB.461 - FitSonic00
MenSelchrFaceB.462 - FitSonic05
MenSelchrFaceB.463 - FitSonic04
MenSelchrFaceB.464 - FitSonic02
MenSelchrFaceB.465 - FitSonic01

No problem   

Can't you do the same thing that you do for the jigglypuff with the captain falcon helmet?