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.
I am not sure if I have understood your question correctly.
Do you mean to say that you want to change the background color so that alternate row of form is displayed in the same color?
Please explain your requirement a bit more in detail and we will surely help you. You may also like to share a screenshot as well on how you want your form to look or where you want the changes to appear. The following guide should help you how to upload image in forum post: http://www.jotform.com/answers/277033
We will wait for your response.