Rockstar energy Gears of war codes

Hey gamers , rockstar energy drinks have a promo where there's a code under the tab . You sign up on a rockstar page and enter the code and it's supposed give content. How does it actually sync to your game though? They don't ask for gamer tag so I don't see how to do it ,anyone know? Thx

@ominous_titan: I would help to know what game you're talking about...or are you just a shill advertising Rockstar's promotion?

@csward: @csward: maybe you should read the topic title before you act like an ignoramus to people asking for help. I figured it out anyways. Fucking squid