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.
How to change a background image in theme?Asked by meckjohnson on April 28, 2015 at 02:33 PM
You should be able to do that in your Form Designer, but if it is not working we can help you with that as well.
This is the link to the video that will show you how to make the change in your Form Designer: http://www.jotform.com/form-designer/tuts/episode10/
Do let us know how it goes.