This window gives you access to the various site user editing tools available to you.
Users/Groups List
This button takes you to a list of the Users and Groups in the site.
Edit Users
This link will take you to a list of users. There you can edit user's permissions, activity logging, and group membership settings.
Edit Groups
Click on this button to go to a list of user groups for the site. There, you can edit, add, and delete groups.
Edit Organizational Units
This button will take you to a list of organizational units for the site. There, you can edit, add, and delete units.