For all the destination groups, you can edit any group when required. Click on Destinations link available in the left sidebar. The sub-links appear as below.
Click on All Destination Groups link. The All Destination Groups page appears, and you can see all destination groups.
Note: The backend system lists a few default destination groups and you cannot see the edit option to these groups.
Locate the target group that you want to edit.
In Action column, click on Edit button. The Destination Group Information page appears. Change the group name, or change the image icon, as below.
Click on Save button to save the changes.