You can see the index page, click on CREATE NEW button to create a new group.
After creating a group, an admin user makes the essential screens available in groups for the newly created user.
NOTE: Group is used for Roles-Screen Mapping. In group, admin and non-admin users are available. The users those who are Admin can create/make some others as Admin and can view all users and groups of admin as well as non-admin users. Meanwhile, non-admin users can just use the roles applied to them and they can view the users and groups related to the non-admin users.