Note: user management panel is available only for the users with the ADMIN role.
In the user management panel select "Roles" tab:
On this tab you can view the full NGB users' roles list. Here you can grant/refuse roles to the users.
You can search specific role or limit displayed list by typing a role name in the query string in the upper side of the tab.
To edit a role click 
icon opposite the role name.
In opened pop-up window: if you want to appoint the role to each new user by default set "User default" checkbox (1), if you want to grant specific user(s) by this role - select them from the dropdown list (2) and click "Add" button to confirm (3), if you want to deprive specific user(s) of this role click "Recycle bin" button opposite the user name (account) (4). After all changes have been made click "Save" button (5) to confirm:
You also can grant existing users from the example above by the role through CLI using the command:
$ ngb add_group {ROLE_NAME} -u [email protected],[email protected]