ScubaDock is not a booking system, and it does not embed Rezdy's widgets or calendars. Each course and each trip has its own booking link in the builder. Paste the Rezdy product link there, or any other https booking page.
When you paste your current site, ScubaDock only looks for FareHarbor links to pre-fill, so you add Rezdy links by hand, using the steps below.
On a published site, a course or trip with a link shows a Continue to booking button. The button opens the link in a new tab. ScubaDock counts the click. The diver pays on Rezdy, not here.
If a course or trip has no booking link, the page sends the diver to the shop's contact page instead. The contact page can also show a WhatsApp button, once you add the shop number, and an inquiry form after you publish.