FAQ Q147: Can I add a rental agreement (contract) with terms and conditions of a rental?

Yes, you can do this in site settings > reservation form layout (more info about form items in general in Q142). You'll need to add an item of type 'Agreement'. Set 'name' to e.g. 'License agreement' and comments to the contents of the agreement. If you want the agreement to open in a new window (e.g. in case it's very long), instead of typing its contents, enter the URL where the agreement is located, starting with http://

Your visitors will then be required to agree to the conditions, or their reservation will not be entered into the system. You will also clearly see that the conditions were accepted by given customer when you go to the reservation details page for given reservation.

Another possibility is to add an item of type 'checkbox' to your reservation form and make it obligatory. The customer will then need to check the checkbox in order to create a reservation. The checkbox item can be preceded by a 'static html' form item where you can format the content/layout of the agreement in any way you like (including an image etc.)