ModMii =/= LetterBomb. If you cannot tell the difference, I don't think you should be doing anything related to homebrew on your Wii (right now), you will quite likely brick your Wii shortly.
My advice (which is not to give up on homebrew) is to go and read about stuff before you proceed. Knowledge is the best defence against bricks. Know exactly what everything is, what it does and why you need it before using it on your Wii.