JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
Here is how you can do that:
1. Open your Form Builder and go to Designer:
2. In Designer on the right hand side you can change the background of your form:
Hope it helps, if you need further assistance please let us know.