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.
You can change it from the Thank you page. If you want to redirect user to external URL after form submission, you can select "Redirect to external link" radio button, and then can enter the URL in text box. So after form submission user will be redirect to that external URL:
Also please check the below guide, which explains how to setup Thank you page:
If you have any query, or need further assistance, feel free to revert back.