When you need to create a new Role in ROSTERkey, use the "Configuration -> Roster -> Role" configuration page.
You will need to enter a unique Name and Code for the Role. You can optionally select a colour and tick the Rover check-box.
If Rover is ticked, then anyone who has this Role as their default Role on a shift is able to be automatically assigned to other Roles in which they are qualified, by the system using the "Assign Rovers" feature.