Hi Michael,
The Service Access tab will be available if the feature has been enabled for the domain. As the System Admin, click on the
Domains icon. Then right click the desired domain and click
Edit. On the Features tab you'll see an option for
Control of Service Access. Checkmark this and save the domain. Now, as the Domain Administrator, when you edit or create a new user, you'll see a tab for Service Access. You can review more information about this tab in the
Users help document.
I hope this helps!
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com