How can a delegate change his booking details after submitting?

When using a booking form on Jotform, the delegate completes the form and submits which in turn send the delegate a confirmation email of the information supplied.  How can the delegate change his information and re-submit?

First of all, Welcome to JotForm and JotForm Support Forum. 

It is possible to let your users edit their submissions at a later date with our "Edit Link" feature. Please find the following guide in order to see how to let your users edit a submission after submitting the form: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date 

I hope this helps.

Please set it to your form and let us know if you need any further assistance.