After you have created the form, click Settings, then disable the Limit to 1 response option. (If you leave this option enabled, users must sign in to Google to interact with your form.)
Click Send. Then click the pointy brackets, then click Copy. This will copy a snippet of code to the clipboard on your computer.
Create a new email message, and paste the copied code snippet into the message. Send the message to and let us know where to place the form on your website. We'll send you a support ticket to let you know that it has been added.