I have integrated the Marketpress with Appointments+

I have integrated the Marketpress with Appointments+ plugin. Now, when I go to the Appointment Product Page, its showing me a form to select the service, service provider and to choose a time slot for the appointment. I provide all these things, but at the end of the page, when i click the "Buy Now" the page reloads and nothing happens. I want to show the "Add to Cart" button here which is not appearing here. Can you please guide me in this regard.

Thanks