Tock Reservation Embed on Button

I can’t quite figure out how to make this work. A restaurant I do work for switched from Open Table to Tock. Open Table’s code simply lived on the page and you could book inside the website. Tock has provided a head code, which I have in the head of this page:

They also provided this: " View All Reservations " - See screenshot

I can place this in an embed code and show the “view all reservations” command and it works, but what I want to do is have the existing button on the page open this script instead.

can anyone help me?

Here is my public share link: LINK