The system does not allow any user to delete a predefined group provided during installation. See Pre-defined users and groups for more information on this topic.
Use this procedure to delete a group:
Select Adminstration > Access Groups > Groups
The Groups administration page appears.
Select the desired group from the Groups administration page and take note of any users presented in the Users pane.
Note:
The Users pane lists all users associated with the group. If there are users associated with the group, you must delete the users or assign them to another group prior to deleting the group. See Changing a user account's assigned group.
Once all users have been cleared from the Users pane click Delete.