How do you use cheats in Call of Duty modern warfare 2?

First you have to complete the game in any mode (Recruit, Regular and so on.)

Then after that you should start up a mission. To do this click select mission, then click a part of the game. And now to the end. When in game press escape on your keyboard. And on the menu there you should see cheats. Click it, then enable / disable (Turn on / Turn off) the cheats you desire. Hope this helped.

/Richard

You Should Also Press To Bring Up The Typing Space TO Type Your Cheats Good Lucky Mate.