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.
I'm not quite sure if I understand your question.
But, if what you want is to delete old submissions from your account you could accomplish this by downloading your old submissions in an Excel spreadsheet and then delete them from your account. If the submissions include uploaded files, you can download these files using the following app: http://apps.jotform.com/app/file_downloader
Let us know if this could be a viable solution for you.