1. Log into your Email Admin Panel (Webadmin) by going to http://mail.domain.tld and login as webadmin@domain.tld
2. Navigate to Settings (gears icon)
3. A list of services will be displayed - click on Domain Settings
4. Click on users
6. Navigate to User you want to provide admin access to
7. Click on the User and edit
8. Locate Enable domain administrator access and Set
9. Save
10. Now when this user login to webmail at http://mail.domain.tld they will be able to manange email accounts