While on the form overview page, click on the form preview icon, as shown in the screenshot below. Afterward, send the submission and see the current version of the thank you page.
You will see the following message appearing after you submit the form:
1. Edit Thank-You message
Go back to the form overview page and click on the “Form Settings” button.
In the “Form Settings” page, scroll all the way down to the “Submit Actions” field. Here is where you can edit the message on the thank you page.
Continue by editing the text editor with your custom “Thank you” message. Make sure you get the most out of the available formatting options and make the message stand out, e.g. by making the text bold or adding a link.
Scroll up on the page and click the Save button when you are finished with editing.
Here's how the Thank-you message would now appear in the live form:
2. Redirect to custom URL
To link to a custom URL instead of a message, go to the Form overview page, Settings and Submit Actions again.
Scroll down to the “Submit Actions” section and change the submit action to “Go To URL.” When the form is submitted, there will be no thank you page. The user will be redirected to the URL that you type in here. Use the following URL formats:
https://testwebsite.com or https://www.testwebsite.com
Submit the form once again to see the redirect to the new URL, which you’ve just added.