How can a person review and make changes to their form after they have submitted it?

My form is at https://form.jotform.us/DLAForms/conference-information--registratio.

Once a person has submitted their form, is there a way for that person to go back and make changes to their form?

To my understanding, you want the user submitted to your form to be able to edit the submission on a later date. If yes, 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 Preview the form before submitting the form, please add the Preview Before Submit widget. Here's the link: https://widgets.jotform.com/widget/preview_before_submit

I hope that helps.