How do you put in Ben 10 Ultimate Alien Cheats?

This is my first time playing a Ben 10 game on a Xbox 360. I have always played it on PSP.

All that I know is that you go to the cheat menu like always.

What is confusing me though is that there is cheat menu inside the game, and in

the menu you use to get in the game.

I don't know which cheat menu to use.

I am trying to unlock the alien called Rath.