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.
Thank you for posting your question.
Unfortunately, it's unclear what you mean with just the title 'inserting a picture'. If what you mean is to add a picture on the form, you can check this user guide: https://www.jotform.com/blog/13-More-Options-for-Adding-Images-to-Your-Forms
But if what you mean is adding an image on your products, you can do this by opening your payment wizard and proceed going to the product items page
Select the product and below the product details where you you can add the description and price, you will see Image URL (Optional), add the link to the image there.
If you have questions, please do let us know.