Remember that only the administrator user can configure services for the salon and also the additional services. Services are always configured on the salon's own tab. Categories, services and additional services can always be employee specific.
Book Salon has created some ready-made default service categories and the additional services related to them. You can use or disable these ready-made service categories and additional services by clicking the activation button on the left side of the services.
You cannot change the names or service descriptions of these default service categories. You can create a new category below the default service category.