21_create_user_group.png shows the Create User Group page. From top to bottom, left to right, are the following components:
The Create User Group label and to the right, the Cancel and Save buttons
Following the label are from top to bottom, a Name field and a Description field. If you are in multi-master cluster mode, there is a Make Unique checkbox next to the name field, which you can click to ensure that the user group name will be unique across nodes.