from ModMii Classic's main menu, type "4", then "DML", then pick the rev you want to build, then "d", then "y". Then install the DML wad you just created on your Wii. Then you can access it via sneek+di, neogamma, wiiflow-mod, cfg-loader-mod, postloader, and probably usbloadergx. You should still read up on DML to make sure you save your GC games to SD:\games\ on a properly formatted sd card in the proper fst format (ie. each game is saved as a folder with all its contents extracted to seperate files). ModMii can do this for you (from main menu, enter "S", then "4"), but ModMii uses wit.exe and while wit.exe usually works fine, crediar's discex tool is recommended for best results.