Hello Bar/Mailchimp Integration

I recently installed Hello Bar into my BigCommerce store but am looking for a way to integrate a mailchimp field which automatically sends a generic email from mailchimp to the subscriber. This field needs to be inside the hello bar. i.e. file:///Users/bryancarpenter/Desktop/hellobar-solo/[login to view URL] This should be a fairly easy job for anyone with any experience in html and javascript. I prefer someone who has experience with BigCommerce but its not required. I will grant you access to the mailchimp account to get <embed> coding but cannot give you access to my BigCommerce files although I can give you any html coding you need from it. It seems to be a fairly simple task but I just don't have the experience with html to figure it out. I will also need an explanation of how this works so that I can then edit the form as I please.