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.
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Can I edit a submission based on email feedback from the registrants?Asked by kshores on February 23, 2017 at 05:04 PM
Due to discrepancies in timing, some of the registrants need to choose other events to sign up for. They are letting me know by email and I would like to adjust their choices on jotform. How do I edit the spreadsheet?
You could allow them to edit their submissions, here's a guide that will help you with that: https://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms
If you have your form integrated with Google Spreadsheet then the record should be updated automatically when the submissions is updated too.