Can you edit after submitting form

Yes, that's possible and here's how to allow users to update their submissions http://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date

If you also want to edit their submissions, you can do that in your form submissions page. https://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms