How can I allow my form users to edit form details

Hi! May i ask how do I allow form users to edit the form details after they have once completed the form? Is it possible for them to retrieve the form they have once completed and make amendments on that?

Because I would like these form to be link to Google spreadsheet, and would like the information within the form to be as accurate and updated as possible. Thanks!

You may allow your form users to update their submissions via the autoresponder emails that they receive by adding an edit link for the submissions there. You can check this guide to know more: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date 

If you have questions or if you need clarification in any of this matter, please let us know.