De que forma o usuário que já respondeu ao formulário pode editar sua resposta novamente?

Yes, you can provide them the edit link. Here's how you can add the edit link on the form: https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date 

If you want to manually give the edit link, you can also do that. Here's how:

1. First, this is the format you need to have: 

https://www.jotform.com/edit/{submission ID}

2. You need to get the submission ID of the one you want your user to edit. 

3. You can get it under your submissions page and enabling the "ID" check box in the settings page.

Here's a sample edit link of one of my submissions:

https://www.jotform.com/edit/342498159975265646 

I hope that helps.