For Facebook, follow these steps:
Make sure you have a business Facebook page and not a personal one. Add or edit a button with Call us / Contact us, where you add the link to the booking page created by us.
For Instagram, follow these steps:
Click on the profile icon in the top right Settings Enter the link to the booking page created by us in the Website section
For your own website: All you need to do is insert a scheduling button that includes the booking link provided by us.