As of March 21st 2019, the Mailchimp for Shopify integration has been removed from the Shopify Marketplace. For existing connected users, the integration will remain in effect through May 12th.
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.
As far as we know, the 'Form Action URL' setting of the Turbo theme will continue to function for adding email address submissions to a List on Mailchimp. We will keep you posted on the best next-steps for your email service integration as we learn more about how the integration with Shopify and Mailchimp will be affected.
Please note that if you encounter questions or concerns about installing, setting up or syncing email addresses using MailChimp, we recommend contacting their support team.
To enable MailChimp:
Go to: Online Store > Themes > Customize > Theme settings > Newsletter.
This tab will look something like this:
As you can see, by default your MailChimps URL is not active, in order to activate this your will need to find your MailChimp form action URL, this can be found in your MailChimp account. To activate your MailChimp integration please follow the following steps:
1) Login to your MailChimp account.
First thing is first, you will need to login to your MailChimp account, if you currently do not have a MailChimp account you can create on here.
2) Head into your list, or create a new one.
If you are familiar with MailChimp and you have already created your list you can skip this instruction, otherwise from the MailChimp dashboard, please click "create a list".
3) What's a list?
Think of a list as where you will be sending all our your newsletter subscribers! After you have entered your information for your list you will be presented with your listing as shown here, for this example I called my list "My List".
4) Grabbing your MailChimp URL.
To grab your MailChimp list URL you will need to click into the list you have just created or an existing list on your MailChimp account, once you have done so you can click the "Signup Forms" tab. After clicking this link your page should look like the following:
Once you are presented with this page please click into the embedded forms option by hitting the "select" button to the right. Once you have clicked this button, on the next page you can scroll down to the "copy/paste onto your site" section, here you will find your MailChimps list URL as outlined below, please note that your URL may appear different:
5) Adding your URL to your theme options
After you have grabbed your MailChimp list URL you can head back into your theme options found in Online Store > Themes > Customize, here you can navigate to the "newsletter" tab and add in your lists URL:
Once you have added in your lists URL, please save your theme options. You have now successfully added MailcChimp Integration into your theme!