Step 1: Click on My Apps then Get More Apps

Step 2: Click Learn More on the Mailchimp app

Step 3: Click on Connect Mailchimp

Step 4: Log in to your Mailchimp account

Step 5: Authorize Housecall Pro to access your Mailchimp account

After authorizing Housecall Pro to access Mailchimp you will see the screen below. At this point you have successfully set up the Mailchimp integration.