MailChimp Integration Not Syncing Subscribers

We bought the Pro version of WooCom Coupon Box and installed it on our site. We then setup the Mailchimp API Key in the Email API section and it connected successfully. The plugin is storing the email addresses of everyone who signs up under the Email Subscribe section of your plugin but it’s not actually sending them to our MailChimp account. How do we make your plugin send the email addresses to our MailChimp account?