How to allow users to edit their submission?

Need name of widget or app that allows form recipients to change data from previous submission.  

If you need to allow user to edit their submission, simply create an autoresponder notification: https://www.jotform.com/help/26-Creating-a-Form-Autoresponder 

There, make sure to include the edit link:

Let us know if you need more help, we will be glad to assist you.