How to add background image?

We have received an empty question from you and I am not sure if I have understood your question correctly. 

Do you mean to say that you want to set background image in form? Yes it is possible to set form background by injecting custom css code. Please inject the following custom css code in form to add form background image:

.supernova {

    background-image: url('YOUR_IMAGE_URL_GOES_HERE');

}

You need to add your background image URL in the above custom css code. The following guide should help you how to inject custom css code in form:  https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes 

Hope this helps.

Do get back to us if you have any questions.