How do I clear form results to allow more space? I don't need the forms after they're filled out

I want to keep free version.  Our use is relative low.

I have checked your account and see that the total submissions of your account are 501. Since the total storage limit of the free subscription accounts is only 500 submissions, the oldest submissions will be deleted. Do you mean to say that the submissions need not to be stored once they are submitted? If so, you may delete them from the submissions view. Please refer to the guide below that can help you in deleting the form submission data.

https://www.jotform.com/help/377-How-to-Delete-Form-Submission-Data

Please be noted that deletion of the form submission is permanent and the data cannot be retrieved back again. If you need the submission data to be backed up, you may consider exporting the data to Excel or integrate Google spreadsheet. 

If you want to store the submission data within your JotForm account, you may consider upgrading the account to Storage plan at $5/month.

Hope this information helps! If you have any other questions, please let us know. We will be happy to help.