Popover + Mailchimp

Hi,

I'm using this plugin to aid capturing addresses for a mailing list that is using Mail Chimp. Is there a way/rule that will STOP the popover once you have registered with Mail Chimp? Currently have Mail Chimp set up to 'return' the user to a page on the site that has a 'reward' for opting in, but the popover appears again as you enter the site. Is there some way of determining the referrer, then adding the cookie to stop the popovers?

Thx
Tony