The second screenshot shows the Administrators page, where you can add new server administrators, modify accounts for existing ones, or remove accounts altogether. This feature is new in Frontier 9.0 — in previous versions, administrator accounts would have to be created by hand in Frontier’s object database.
In addition, you can grant WebEdit access to administrators via this page, saving at extra step: WebEdit users don’t have to be configured separately (though they can be).
Tomorrow’s screenshots: Virtual Domain Hosting