[Appointments+] Want to disable the create appointment link

Dear sir,
Appointments+ is great for our booking service, however we are not allowing users to create an appointment through the website directly, we just want to show the timeslots to them, and users should make a call to confirm with us, and then we update the timeslots through backend. Therefore I would like disable the links which allow they create online. Is there a configuration method to do so? or which part of code should I look for the simple delete the link?
Thanks a lot.
Frank