I believe you are referring to IOSs. IOSs are basically Wii system files. If you need a greater understadning of IOSs and cIOSs, read this; http://www.wiihacks.com/recommended-...explained.html
Anyway, once you read what they are, you still need to install them. There are two ways to install them;
1) .wad files. Use the wad manager application in homebrew channel to install these files, self explanitory once you try it.
2) Use the appplication DOP-IOS Mod; Downloads - dop-iosmod - Project Hosting on Google Code
This will have all the IOSs and you'll be able to install them through wi-fi.