Once you have created a group there are a number of changes you can make to it, including editing the group name, deleting the group, and adding or removing users.
Information: You can find the groups you have created on the left hand side of your Users page.
If you click Groups under Team, you will be able to see all groups and the child groups under them.
Clicking on the button on the right will give you a few options.
Clicking on Create New Group will let you create a group anywhere in the hierarchy.
You can only delete a group after you have removed all users and archived all posts under it.