To join an Alliance, tap on the Social icon then head to the “Alliances” tab. From here, tap on the “Join an Alliance” drop-down arrow to view pre-existing Alliances or search for a specific Alliance if you know the name.
When you locate the Alliance you wish to join, tap on the banner then select the “Request to Join” button.
When you locate the Alliance you wish to join, tap on the banner then select the “Request to Join” button.