The embedded version of Smoothbook requires a subscription.
For just USD $9.99 / month you can embed your booking calendar directly into your website and make it your own: no advertising, no branding, your customers never need to leave your website.
To purchase a subscription please go to Smoothbook and select 'My account' -> 'purchase subscription' from the main menu.
You can add a booking button to this page for no charge (opens calendar in external window) by going to Smoothbook, selecting settings from the main menu and clicking on the 'calendar settings' icon. Uncheck the option: 'Embed the calendar seamlessly into your web page'. You will have all the functionality of the calendar but in an external page.