Manage your local business links – Google Business Profile Help

Go to your Business Profile. To manage your links: With Google Search, select Booking, Food ordering, or Pickup and delivery. With Google Maps, select Edit profile and the transaction type that you want to add a link to. Select Add link. If you already have links on your Business Profile, select Add another link. Enter the URL that you want to link to the button. Select Save.

https://support.google.com/business/answer/6218037?hl=en