A group leader is a person who has been granted administrative access to a particular group. Leaders are able to post cards and manage their assigned group(s) in the same capacity as the owner. 

To declare a leader in a group: 

1. Go to the Members page for the group where you want to declare a leader
2. To the right of the member you want to declare as leader, click on the drop-down under Status. 
3. Choose the new status of the member as Leader.