You can add user roles in order to give varying levels of access to the back end of your calendar and booking page.
Author: Allow you to publish and edit only your own events.
Editor: Allows you to publish and edit all events in the calendar.
Admin: Allows access to the whole calendar.
From your calendar dashboard click on "Calendar Users."
Add in the user name, email and role.
You can manage, edit and delete your users you have added.