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The only way I'm aware of to completely remove FaceBook from any phone that it comes preinstalled on is to have a rooted device. If you are rooted then the only thing that will happen is that the contacts associated with facebook will disppear.
I wouldn't say you are too dumb - you are new and learning.
To unsync try going into Settings, then Accounts & Sync, FaceBook should be in there and you should be able to uncheck the box next to it.