This Add-on for Super Forms can add and update your subscribers. If the email address does not exist for the selected list, a new subscriber will be added. Optionally you can let the subscriber confirm their subscription by sending the default MailChimp confirmation email. If the email address already exists for the selected list, the subscriber information such as, First name, Last name, and optionally their interests will be updated. This is very useful if you add more groups (interests) to a specific list after some of your subscribers already subscribed. This way your users always be able to adjust their interests at any given moment. It is totally up to you if you want to send the default MailChimp confirmation email. Simply select Yes/No. This plugin uses the new MailChimp API version 3.0