Add a custom redirect to take users to your own ’thank you’ page after they submit your form.
By default, your form takes your users to your Success Page which can be fully customized to suit your form goal, branding and messaging.
To replace the Success Page with your own, head into your form and click “Success” above the form you’re building. In the sidebar you’ll see an Add Redirect button, click it:

Now when your form is submitted, instead of the built-in Success Page being shown, your users are taken to your own URL.
You can remove the Custom Redirect or change the URL to a new one anytime.