HTML widget calling a form for subscribers

Hi Guys I have a HTML widget that links in to a clients external form, the issue I have is that once the user hits submit, it redirects to there website, is there a way I can simply display a ‘Thank you for subscribing message’ on the submit button has been pressed without leaving the page I’m building and then close the subscribe box automatically?

That’s something you’ll need to adjust on the submit form itself – this isn’t something that you can control in the HTML widget.