When you sign up for SchoolBooking you are asked for a site ID. This provides you with a unique login page. The site ID prefixes the schoolbooking.com domain (myschool.schoolbooking.com).
If you need to change your Site ID, go to Administration - Settings - Other Settings, and select Global Settings.
Important Note : If changed, any existing staff shortcuts or weblinks that direct straight to your site's login page will also need to be adjusted.