Wii Scrubber isn't working

I'm new to brawl hacking and I just recently installed homebrew and USB Loader GX on my wii. My brawl disc broke so I have to use a downloaded brawl. How do I get hacks on a downloaded brawl (Like skins and such) Im new to all this like I said and I can't really wrap my head around all this stuff. I need simple answers, please!