The listing, Injustice Gods Among Arkham City Skins has ended.
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How to Use Xbox LIVE Online Game Codes
Enter your code through either your Xbox 360 console or Xbox.com.
Xbox 360 Console
1. Press the Xbox 360 Guide button and navigate to the Marketplace area
2. Select "Redeem Code" to enter your code
Xbox.com
1. Go to Xbox.com and sign in
2. Select "My Account"
3. Click "Redeem Code" to enter your code
4. The next time your console is connected to Xbox LIVE, your purchase will be downloaded