If you are going to manage a lot of users, it might be a good idea to organize them in separate groups (and perhaps delegate the administration of each group). A user group is simply what the name implies - a set of users grouped together with the intention of giving group administrators a way to manage these users. A user group manager can add new users to the group, delete users, and give permissions to resources (but only to resources the group admin already has access to). Click "new user group" in the left menu box.

Enter the user group name and, optionally, a description of the group. Then save the user group.

To add users to a group, edit a user group, and click on "add members". Select the users to be added to the group, and click "Save". On the user group page you will see all the users listed.