How can a leader leave the team?

To leave the team, a president must appoint an officer to replace them. If they don't have an officer, they can promote a member to officer status and then promote them to president. Then the former president can tap on the button with 3 dots and tap, "Leave."

To dissolve the team, a president must remove all members from the team. Once the club is empty with only the president remaining, the president can tap on the button with 3 dots and tap, "Disband."

To replace a leader in a group, when that leader is stepping down? And what is a President of a club?