Any user who is registered can be designated as an administrator in Open LMS. To do this, go to Site administration > Users > Permissions > Site administrators.

Two boxes will appear on the screen: the one on the left with users who are already administrators, and the one on the right with the existing users in the system.

To designate a user as an administrator, search for them (below the box on the right) and select them, then click Add. Their login will move to the box on the left.

You can reverse the process (select on the left and click Remove to revoke a user's administrator status).