Go to quest.redbull.com, enter the code, once the code is confirmed click on the link below that takes you to Bungie.net and sign into your account. A few clicks there and you're set. Please live somewhere that the codes are unavailable for purchase. If you're in the USA, you can buy the cans anywhere for $2.99 (that's what mine cost).
EDIT: I'm out guys. Sorry. You can buy these cans anywhere in the US. NOT JUST 7/11. Go get 'em and share any extra codes, Americans
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#Destiny
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US, would love a redbull code. MN walmarts aren't getting the special destiny cans, and the closest 7/11 is literally 5 hours from my home.