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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Please follow the steps below to delete a response:
1. In My Forms, select the form and then click the "Submissions" button.
2. In the Submissions page, you can click the "Delete" button or "Delete All".
3. You can also click the "X" button to delete single response.
Please check this related guide: how to delete form submission data
Hope that helps. Thank you.