To edit a group, click the Relationships → Groups → Capacity Groups page. Click the name of the group to open the Update Capacity Group. Alternatively, you can click the ellipsis to the right of the capacity group Description and select Edit.
...
Update Capacity Group - Click the button to add the capacity group to the relationship. If any required fields are empty, this button places a red border around the required fields and displays the word Required beneath the field.