Step 1; Go to www.battle.net. (If you don't have an account, at the top of the page, click Create Account).
Step 2; Go to account page. Click Add Game
Step 3; Key in your games cd-key and click ACTIVATE GAME.
Step 4; Run the Blizzard Downloader to download the game and enjoy your game.
Important! The product does not work on RU, BR, CN Battle.net accounts.