If you don't know how to manually put Gecko codes in Dolphin, put on your happy faces, cuz this will tell you how to!

Yeah, like that! Its easy, really.
PART 1: Open the INI
You can do it 2 ways, auto, or manual.
AUTO
Right-click Brawl (or any other, it works for any game) and click Properties. A window should pop up. Click the "Edit Config" button on the lower-right.
MANUAL
Go to [PROGRAM DIRECTORY]\User\GameConfig. Find the INI file. Its [GAME ID].ini, so Brawl is RSB?.ini. The ? can be A, E, or something else dependant on what the ISO's reigon is. US Brawl is RSBE01.ini, US MKWii is RMCE01.ini. Open the file.
PART 2: Open your code file
The title says it all. Open the TXT file with your codes.
PART 3: Put the codes in
In the INI, find the line that says [Gecko]. Make a new line under that, and put in the codes. DO NOT copy and paste the whole list and paste it in

. Put it in like so:
$Codename [Author]
CODE
Sample Code (in INI)
$Fake Code [RyanAnayaMc]
05084F B8C950
693FF8 D9S0C
To automatically activate it, replace $ to +$ (dollar sign to Plus then Dollar sign with no space). Save your INI file. Activate desired codes and play.
The code in the TXT file may be like so:
Fake Code [RyanAnayaMc]
05084F B8C950
693FF8 D9S0C
*This is a baloney code for tutorial purposes
The * indicates a note. You may copy the code, just be sure to add the $ to it.
It may also be like this:
Fake Code w/ blanks [RyanAnayaMc]
05084F B8XX50
693FF8 D9S0C
* XX values
01 Fake Value
A4 Fake Value
Replace any X, Y, Z, and any others with HEX value (HEX is numbers 0-9 and letters A-F). DO NOT replace anything A-F.
Example:
Fake Code [RyanAnayaMc]
05084F B8C950
693FF8 D9S0C
Look at the FF in the last line. It is a hex value. Don't replace it. Thats all I have to say. Tell me if I forgot anything, if the fake code works, and any additional concerns.