What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately, you cannot apply script in the default Thank You page. However, you can add a link of your form in the default Thank You page. So you need to get the form's direct URL for this.
Another work around is to redirect the Thank You function to custom page. On this webpage, there is a script that will auto-redirect to another URL. However, you need to create a custom page and upload it to your web server. Please check this guide: Create-a-Custom-Thank-you-page-with-Auto-redirect
Hope that helps. If you have any questions, let us know. Thank you.