Well you have to be logged in to your account, which you are to make this post, then go here:
http://www.gamesas.com/limitededition
In your limited edition game box you have your game code and your limited edition code for your bonus stuff which you enter the limited edition code and don't forget to type the" - " between the letters and numbers and then press the redeem button.....
Now start up crysis 2 and your bonus gear can only be used with multiplayer, not single player..