To let your respondents fill out your form multiple times, drag the Fill again button from the left-hand-panel. This will add a customizable button to your ending page.

You can edit the button label in the right-hand panel by clicking the settings icon.
<aside> 📝 Note: The Fill again button is only available on ending pages.
</aside>
You can set a page for respondents to start from on their next form fill. Click the button on your form followed by its settings icon. In the right-hand panel, toggle Start from page and choose a page under Step. Skipped pages will auto-fill with their previous responses.
