To activate a Blizzard game key, you need to have a Battle.net account (you can create one here). After that, simply follow these steps:

1. Visit the Blizzard website and log into your account.
2. Click on your email address in the top right corner and select “Account Settings.”

3. On the account settings page, select Account Overview from the menu on the left.

4. Paste your game key into the provided area and click the Redeem Code button.

Check out which Battle.net Key Activation cards are available for purchase now.