Did you make your code file with the file replacement code on?

I have no clue what you mean... How do I make a code file and with what? Is it with that "Code Manager" program I was told to download?

Alright, here's the deal: I have downloaded Gecko OS and have filed a link hack under private/wii/app/RSBE/pf/link and when I click launch game on Gecko OS it says no SD Codes found.
I think I just made a typo error, but I have no idea, I don't understand most of this... help me out...

Umm, I didn't understand most of that. Please explain to me, step by step, how I can download hacks for link and/or sheik onto brawk using Gecko OS.