JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
The best way to accomplish this would be to include an edit submission link in your email autoresponder:
This would allow the user to partially complete the form and then return to their submission at a later time to update the rest.