NEED HELP W UNCHARTED 3 ONLINE!!!!

I just bought the game and trying to play multiplayer but cant. It says i need to redeem a code... The playstation Card code... What is that, and how do i get it?????

Source: http://ninjashoes.net/forum/showthread.php?78172-NEED-HELP-W-UNCHARTED-3-ONLINE!!!!&goto=newpost

Viacheslav Datsik Marcus Davis  Tony DeSouza  Edwin Dewees  Nick Diaz