If you want to do any changes after saving the services or want to edit something in details, working hour, break, day off or calendar, then go to add module, services after that you will get the list of the services which you have added in the system, select the service which you want to edit and click on three dots then edit 

after clicking on edit you will see all the details like service name, service description, service color time and price, staff who can provide the services and more, you can edit all those details from here and save it