I want the customer to be able to edit their entry or form.

I am not understanding. I want the customer to be able to edit their entry incase of an update or a incorrect form that was created.

If you want to let the users edit their submission, please follow this guide: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date

If you want to edit their submissions, please follow this guide: https://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms

I hope this helps. Thank you.