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.
You can delete the form submissions in the Submissions page only. There is no option to delete a submission in My Forms > Inbox.
Inside the Submissions page, you'll see this delete buttons where you can delete a single submission or all of them.
Please check the complete guide here: How-to-View-Form-Submissions
Hope that helps. Thank you.