To give a user admin rights on your Hideez Enterprise Server, you'll need to "Invite an administrator" by sending him an invite email to the email address, following the link in which he can log in.
1. Open the Settings / Administrators tab in the side menu.
2. In the next window click “Invite admin”
3. Enter administrator's email and click “Invite”
4. Open the letter in your mailbox and click on the link specified in this message.