In order to add MailChimp integration to your account you have to:

  1. Go to "Integrations" section.
  2. Select "Autoresponders" tab.
  3. Click on "Add autoresponder" button.
  4. Select "MailChimp" from a list of autoresponder types.
  5. Fill in all required details:
    1. Autoresponder name used to identify it in a list.
    2. MailChimp API key, you can obtain it here.