To create or edit a group, press Configuration > Groups or use the Configuration menu on the left part of the screen.
Of the group's page, you can create new or edit the group. Edit an existing group by clicking button Edit when pointing on the group name.
To create a new group add Title and description, chose permissions for the group. Please note, that some permissions are connected, when you chose one - connected will be chosen automatically, you can unclick any of them at any time.