Why isn't the "submit" button on my MailChimp form showing up?

As of March 21st 2019, the Mailchimp for Shopify integration has been removed from the Shopify Marketplace. 

View Mailchimp's official statement

Learn more about Mailchimp's changes to their integration with Shopify, instructions to sync your contact lists, and manual workarounds for marketing features.

The 'Form Action URL' setting of the Turbo theme will continue to function for adding email address submissions to a List on Mailchimp. 

MailChimp allows you to embed a form into your site, but the "Submit" button often doesn't appear by default because of how their code generator works.

In order for the "Submit" button to appear, you need to modify the code MailChimp provides you:

1. Locate this block of code which populates the button:
   
   

   <div class="clear"><input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="button" /></div>

    

2. Remove <div class="clear"> from the beginning of this code, and the </div> from the end.
3. Your final code should look like this:
   
   

   <input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="button" />