^^^
Wow... I feel pretty oblivious right now lol... Can't believe I forgot to mention this method. What NoSoul said above is the way the OP should go unless there's some specific reason he needs to do it from the vWii menu. Only minor draw back to this, is that you'll either need to start a CFW every time you want to play one of your injected games (unless somethings changed); or the better option, setting up CBHC so the signature patching is done automatically at boot up.
Thanks for refreshing my memory haha! Reminds me, I probably should inject some more myself.