How do I get my popup pro pop up to close once I submit a form?

To Whom it May Concern,

I am using the Popup pro plug in. Everything works pretty fantastically with this plugin. I do, however, have one question: once I fill out the form (my pop up asks people to sign up for my blog) and click the join button, how do I get the pop up to fade away? As of right now, once I fill out the form on my pop up window and click join, I see a little spinning wheel (telling me that my form has been submitted) but then the pop up remains. I would like it to disappear. How do I achieve this?