Appointment+ Add to cart button shows outside store

Hi there,
I'm trying to set up the Appointment+ plugin. It works well with MarketPress only on the Product page. However I do wish to make the integration globally on the website. For example on the page http://topacademy.co/private-classes/
The confirmation will only lead you to the Paypal payment page. I would like the Add to cart button to show up here as well.
Can you help me?