1. Go to "Responses" section.
  2. Select "Comments" tab.
  3. Click on "Add new auto reply" button.
  4. Fill in new auto reply title and check default state of response. Title will be used to identify your responses. State will define if response should be checked for matching or not. After filling all details click on "Save" button.
  5. Configure auto reply as described in "Auto reply configuration" step.