To specify what the members of the new user group can see and do, we'll first specify which Viewing Access Level this user group has. This level defines what users can access and see on the site—but it doesn't give them the rights to do anything.
In this case, we want the new user group to be able to access the backend. For this, we can use an existing Viewing Access Level—the Special level. In the default Joomla setup, anyone with the Special level can access the backend controls.
Go to Users | Access Levels. The existing Viewing Access Levels are shown:
To add the new user group to the Special access level, click the Level Name | Special. Add the new Contact Administrator user group to this level by clicking the select box to the left of the name Contact Administrator:
Make sure to save your changes.