jimario on "[Plugin: Boxzilla] Mailchimp: open box with "message sent" message"

I'm using MailChimp & Boxzilla. I want to make it so that a confirmation message opens up in a box once someone has submitted a subscribe button.

Currently the confirmation message appears on the same page as the form. I would instead like the confirmation message be contained in a popup box. Please advise if this is possible.

https://wordpress.org/plugins/boxzilla/