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This can be achieved also but you will still need the redirection after submit.
I am not sure how you meant it due to lack of details, but if you are embedding the form on a website, then, this is very much possible.
I am on the assumption that you wouldn't want to leave the page where the form was (after submit), and you only want the Thank You page to be a pop-up page.
If the assumption is correct, you can apply the technique described on this tutorial.
If you can provide us more details on your requirement, we will be glad to assist you create the form.
Please let us know if you need further assistance.
Thanks for the response.
Hopefully, I can provide a little more information.
As I explained, what I am trying to do is have another page pop-up after the submit button clicked - I really don't have a need to a "Thank you page", so I am merely using the functionality.
The scenario is a user would come to my site and after agreeing to opt in for emails (subscribe form), a pop-up page would appear giving them access to content on the site that there would be no navigation to. So, I would want them to stay on the same page but get the content from a, if you will, hidden page.
Hope I have been clearer.
I hope that helps.