How does World of Warcraft gain triple experience? Recruit what?

Find someone who wants to practice the trumpet as much as you do

Battle.net

passport

There are two options below, one is the point of transferring things, and the other is.

Recruit comrades-in-arms

Enter the email address and real name of the other party.

The other party accepts the mail

If not, official website has a hint.

After all, enter the game and add the other party's mailbox. A white sun appears to the right of the team name, which means success.