This article is a step by step breakdown on how to enable the contact us option. When you do this setting, a button will appear on the iFrame that your customers can use to contact you by leaving their email address. It will look like this in the picture below highlighted in orange.
Firstly, navigate to Settings > Car Rental as shown in the picture below highlighted in dark blue.
Here, select “Yes” under “Enable Contact us Option in Not Available Classes” as shown in the picture below highlighted in orange.
Lastly, click on the blue “Save” button located at the bottom of the page to save the changes.