Hi MikazaaS,
We have a couple help articles about code redemption. The process is different depending on your console, so make sure to take a look at the links.
http://www.bungie.net/7_Destiny-Code-Redemption-FAQ/en/Help/Article/12131
http://www.bungie.net/7_I-redeemed-a-code-to-get-in-game-content-Now-what/en/Help/Article/12132
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this DO NOT HELP. I've already read those, and read those again now I DON'T have a "use button" next to all the listed codes and they do not show up ingame. So how do I get the redeemed items???