Redeeming a Call of Duty: Modern Warfare II - 1 Hour 2XP + Burger King Operator Skin key is really simple, just follow these steps: 

1. Go to the Redeem site and log to your Call of Duty account.
2. Follow the instructions on the page. 

The key is not working

If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions:

• My key is Duplicated / Already used
• My key is Invalid
• My key is region locked / can't be activated in my country
• My key activated a different product
• My key did not activate all of the content