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.
You can follow this guide on how to delete your submissions: https://www.jotform.com/help/377-How-to-Delete-Form-Submission-Data. You can specify what group of submissions to delete by simply changing the "Time Frame" option in the settings.
Please note that deleting submissions is irreversible, they cannot be recovered after. It would be best to download your submissions for backup purposes.
I hope that helps.