1. Go to Settings -> Integrations.
  2. Tick the checkbox to enable opt-in.
  3. Copy the API key from your MailChimp account and paste it in to the API Key field. Your API key can be found by going to https://us1.admin.mailchimp.com/account/api/.
  4. Copy the List ID from your MailChimp account and paste it in to the Unique List ID field. The List ID can be found by clicking on your list in MailChimp and then the settings page inside the chosen list.
  5. Click Save. The sign in form will now have an additional checkbox to opt-in, highlighted below.

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