How can I display a message as a popup after submitting the form?

Hello, How can I create a contact form with a popup The popup should appear after sending a message Thanks Andreas

I understand that you want to display the Thank you message as a popup after submitting the form. If so, unfortunately, it is not possible to display the thank you message as a popup since the form submission is sent through a JotForm URL only. You may consider redirecting the form to a custom page from the Thank you page settings.

http://www.jotform.com/help/38-How-to-Redirect-to-a-Page-After-Form-Submission

Hope this information helps!