You will need the Full Write Groups permission to edit a group. The permission must reach at least one of the group's campuses. A group admin without it can still save the group's details, but not its campuses, organizations, category, parent group, merchant account or options.
Open the group
Click Groups in the left-hand menu to open the listing. Find the group you want to edit and either click the group name or click the three-dot menu at the start of the row and choose View.
Edit the group
From the group's detail page, click the Actions button in the upper-right and select Edit group.
A window opens where you can update the group's details. See How do I add a group? for an explanation of the available fields.
Note: If you are limited to some campuses, you can change only the group's campuses inside your access. Campuses outside it stay on the group, and you cannot switch the group to All or from All to specific campuses. A group that belongs only to an archived organization cannot be edited.