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 I understood you correctly you wish your users to be able to update the submission without having to fill in the form again.
If this is correct then you can include an edit link on an auto-responder. When they fill in the form they will receive an email confirming the submission and with the edit link they will be able to update it at anytime:
You can see here more details on how to create an auto-responder:
Let us know if we can assist you further.