Any questions, comments, concerns, hackusations, please direct at my xFire: z0mgitzfear

Go into your CoD4 folder, then players, then profiles, then create a new folder, title it whatever you want, (I prefer FEARZ2k14 seeing as how that's the name of the config lelz) and then drag config_mp into the folder. When you start up your game, you'll have a new profile named whatever you named the folder, load it, and you're all set.