The Mail Chimp Signup widget is shown on this page. The plugin is AJAX powered and allows your users to instantly sign up and get added to your MailChimp list that you specify in the widget admin. All you need to do is enter your MailChimp API Key and Unique List ID.
This is a sample widget to showcase the functionality of the S5 Flex Menu system. This menu system contains up to 40 positions and you can publish any widget to any of these positions under any menu item.