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.
Just to be clear, when you say that you're unable to change the background color, when the Background tool on the Form Styles tab of the Preferences (indicated below) is used, doesn't the background color change?
If so, please do the following:
1. Click the Designer button:
2. In the Color Scheme section of the Design tab, use the Background and Frame selectors to choose the desired colors
3. Once satisfied with your selections, save the jotform
Should you need further help with this, please let us know.