How do you use the Starcraft 2 invite a friend when you have beta?

To use the "Invite a Friend" feature in Starcraft 2 during the beta, first, log into your Battle.net account. Navigate to the game's main menu and look for the "Invite a Friend" option, which usually provides you with a unique link or code to share. Send this link or code to your friend, who can then use it to join the beta and start playing. Make sure your friend has a Battle.net account to redeem the invite.