How do I enter cheat codes for transformers the game Xbox 360 version?

I can't find the menu that every cheat site keeps to referring to.



"Enter codes at the "Campaign/Bonus Features" main menu."



I have tried to enter the codes into the cheat code menu but it hasn't worked.How do I enter cheat codes for transformers the game Xbox 360 version?if i could help you, i would, But



1 I've never seen the game.



and 2 i have no idea how to reach that menu either.



i do know that you will most likely need to enter the codes with the D-Pad (the big Grey plus-sign on the controller for those of you who don't know what that is) and if that doesn't work, you might need to hold X too, not sure about that last one.



also, using the cheats deactivates the achievements, so if your son likes those achievements, then i wouldn't use the cheats. (in English; its like a light switch, when one is on, the other is off)