Step 1: Go to
http://us.battle.net/overwatch/en/
Step 2: Login with your battle.net account
Step 3: Click on beta sign up
Step 4: Wait for the email confirmation about getting the beta version
IMPORTANT: Account flagging for the Closed Beta is currently in progress and will be completed be in waves. Please note that this process may take up to 12 hours. If your account has been flagged for the Closed Beta, an "Overwatch Beta" license will appear under YOUR GAME ACCOUNTS in Account Management.
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Wednesday, October 28, 2015