You need Site Designer version 5.0.3499 or later to be able to use this component. That is because it contains PHP files. For that reason also the demo on this page is just an image showing the form..
The form contains input fields for just the most important details, such as name, email and a place to add some comments. There is a PHP back-end script that makes the form work. You find it when opening the Resources of the downloaded file and look into the php folder. Before you can use the form, you need to open this script and edit three lines:
On line 3 you see the mail address 'firstname.lastname@example.org'. It has to be changed to the real siteowner's mail address.
Then on line 43 there is another mail address. It can be used if the siteowner's own address should be kept private. If so, a more public address can be used here. However, if privacy is not important, the same address as on line 3 can be used.
Finally, on line 77 you can edit the URL to a page or site that you want to redirect the visitors to after the form submission.