You should go to Admin panel -> Online tools -> Widgets.
There you can choose:
preferred guest count
preferred area for the widget
You can also use one widget for multiple locations.
In order to add the widget to your website, you should simply copy the HTML link and paste it to your website.
Reservation widget code
Waitlist widget code
This is how reservation widget can look on your website:
This is how waitlist widget can look on your website:
Direct link to waitlist