If I'm not mistaken the Free Cheat option basically requires some hacking knowledge, as you're searching for and changing hex values in the game. (I could be totally wrong about this) To use AR cheats, place the usrcheat.dat file in the proper directory, then make sure cheats are on in global settings, then highlight the game you want to use the cheat on, press X, then Y, then turn on the cheats you want. Unfortunately you can't turn on and off AR codes on the fly, but really, I'd imagine that would cause more bugs than it's worth anyway.