When the game is loading to go to the main menu, just press the "Home" button twice and then press the 2 "+ -" buttons at the same time. once the cheat menu comes up, just press X on the codes u want on. to turn on/off or enable/disable the cheats,just simply press the music note button at the bottom of your psp. Note- You must be at the main menu or in game to be able to turn your cheats off and on.If you have any other questions,feel free to ask:)