What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You should be able to add an image to your form by adding the "Image" field under the "Form Tools" section.
You can also use the Form Designer Tool, you can click the "Form Cover" section there to add an image on your form. Here's guide on how to use that tool: http://www.jotform.com/help/300-Form-Designer-Tutorial-Let-s-create-fantastic-forms-
Do let us know if you need more information on this.