Open your form and scroll down to see the success page.
Then select “source code” and paste the following code where you want the button to be:
<a href="#" style="padding: 10px; margin: 0 auto; background-color: #000; color: #fff; text-align: center; text-decoration: none; border-radius: 8px; cursor: pointer; display: block; width: 100%;">Take the test again</a>
Replace the # in
href="#" with the public URL of your form so the button links to your form again.
Or you can put any link you want the user to be redirected to and change the text of the button from here:
">Take the test again<
Also, you can add this button to different success pages from the left menu of the design tab.
You can see how it works in these templates: