Redeeming a Guild Wars 2 GEM CARD key is really simple, just follow these steps:

1. Log in to Guild Wars 2.
2. Open the Black Lion Trading Company panel. (You can either open it by selecting the lion icon in the upper left of the game screen, or by clicking the assigned hotkey)
3. Click the “Redeem Code” button at the upper left of the Gem Store panel.
4. Follow the on-screen instructions to redeem your key. Make sure to enter the code manually!

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