Connecting Mailchimp

Universe theme has a newsletter sign up form right above the footer area. By default, everyone that signs up to this form is added to the list of your customers in Shopify Admin. 

There 2 ways to synchronize with Mailchimp: 

1. Connecting Mailchimp to your Shopify store
2.  Or simply adding Mailchimp action to the newsletter sign up form. To do so you, go to Theme Editor > Settings > Newsletter and enter Mailchimp Form Action URL.