Got my pre order code from amazon by chattin with customer service.....but i cant find out where to redeem it at :/ can anyone help me out?

From what I read, you get your Amazon.com code within 1-2 days of the game shipping. Mine should arrive within a day, so I'll be wearing my custom gear soon!

depends on your system.
PC: dunno
XBox: press the guide button, over to marketplace, choose redeem code
PS3: cant do it until PSN is back, but its in account management