How to make a AD-User a Icewarp Administrator

Hello,

Actually, i have the Administrator "admin", which was created while installing the Icewarp server itself.

All other users in the domain are imported from Active Directory.

How can i now elevate a AD-User to be a Administrator?

In fact i do not find any way to elevate create a new Admin user at all. Maybe i miss something, but nowhere in the Remote Console or the WebAdmin i have found a way to create or elevate a admin user.