How to activate a WoW Pre-paid Card?
Redeeming a World of Warcraft Pre-paid Card is really easy, just follow these steps:
1/ Log in to your Battle.net Account Management.
2/ Pick the World of Warcraft license you want to manage.
3/ Select Game Time & Subscriptions.
4/ Choose Redeem a Prepaid Card and click Continue.
5/ Put the prepaid game-time code in and click Claim Code.
That's it, your subscription has just been prolonged!