At any time, you can change or add an additional team administrator
Click Users in the left-hand menu
Select the Teams tab
Click the team for which you wish to make the change
In the side panel, click in to Members
Click the more button (three vertical dots) next to the user you wish to designate as the team admin
Click Make admin (if you wish to remove someone as admin, you can use the Revoke admin option)
Need more info on Users & Teams?