If you're trying to install multiple mods at once you'll cause conflicts and it will not work.
Follow how it says to install something. You can just select the mods using MCpatcher, only do one at a time though and patch each time.
OR Extract the files it says to, then patch it with MCpatcher
It does the same thing either way, although I did have problems using mo-creatures and forge, I ended up having to use the test feature in MCpatcher to bypass the updater at the start screens.