Ability to revise form online?

I presume what you would like to do is revise or update the submission made on your form?

If that is the case, you can update it in your submissions page by clicking the "Edit" button.

Please note that you'll need to click the submit button after making the changes so that the submission will update. When doing this, the notifications setup in your form will then be triggered again.

If you would like your users to update their submission, then that it possible by providing them with the edit link. Here's a guide that you can refer to: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date 

Let us know if I misunderstood your concern.