Apps: Where to add MailChimp code
The MailChimp embed code goes at the bottom of theme.liquid before the </body> tag.
Use the code editor to open theme.liquid
Example if you're working from your main live/published theme:
Or if you're setting up a draft theme, choose from your list of themes, find the Actions link for the theme you'd like to edit. Then select Edit code. Example draft theme:
From the Layout folder, open theme.liquid:
Scroll to the bottom of the file
Add the code inside this section:
Save the changes.
Where do I get the MailChimp code from?
You'll need to generate that code from MailChimp:
Here's the full article from MailChimp, it's worth reading from the start: