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.
If you're referring to the payer's info, then this is not editable, your submitter will need to purchase the product or submit the form again if some info needs to be updated.
If you're referring to your info in the payment integration, then this should be possible to do by clicking on the payment field and then click on the wizard icon, I see that one of my colleagues replied to you with more information about this on the thread on this link: https://www.jotform.com/answers/828811-how-can-i-edit-paypal.
If you have more questions feel free to let us know, we will be glad to help you.