Select Users from the submenu to see the list of users. This list is similar to the core Joomla User Manager but has some extended features.
The groups column will show the primary Joomla group that the user is in. Under this it will show the total number of groups that the user has been assigned to (if you have assigned the user to any custom user groups). You can only assign the user to one of the core Joomla user groups.
If a user has not activated their account, you can click on the icon in the Activated column to manually activate their account. Alternatively you can select a number of users from the list and click Activate in the toolbar.
In addition to the normal Joomla User Manager filters, you may also filter the user list on the activated state and a period in during or after which the user registered.