Normally, patients on your practice's website will click the 'BOOK ONLINE' button (right-side of screen) to open the Online Booking widget to book an appointment:

If you want to send a patient a link to make the Online Booking widget appear automatically without clicking the 'BOOK ONLINE' button, simply add this text at the end of your website address link:   ?cc=book

For Example:
If the website address link is https://www.donnadental.ca , then add the text ?cc=book at the end of it, so that it looks like this: https://www.donnadental.ca?cc=book

So now, if you send https://www.donnadental.ca/?cc=book to a patient, and they click on it, they'll go directly to the Online Booking widget without having to manually click the 'BOOK ONLINE' button.
Works on both Computer and Phone.