Instructions
Add a New Account to Battle.net
Log in to your Battle.net account and click ̶0;Games and Codes̶1; from the top menu.
Choose the ̶0;Add or Upgrade Game̶1; option from the menu.
Type the ̶0;World of Warcraft̶1; game key that came with your game in the text box, then click the ̶0;Activate Game̶1; button to complete.
Launch ̶0;World of Warcraft̶1; and log in to the game using your Battle.net account information.
Merge Existing Account With Battle.net
Log in to your Battle.net account and click ̶0;Games and Codes.̶1;
Select the ̶0;Merge a World of Warcraft Account̶1; option.
Type your ̶0;World of Warcraft̶1; account information, then click ̶0;Continue̶1; to merge your account. You will need to supply the country of your game server, your username and your password.
Log in to the ̶0;World of Warcraft̶1; game using your Battle.net account information instead of your previous ̶0;World of Warcraft̶1; account information.