To add a news story without sending a notification:
  1. Start from the onMessage persona
  2. From the Content drop down, select News/Announcements
  3. Next to the category you want to add an item to, click the green + button
  4. Uncheck the checkbox that appears at the top next to Send Notification

Send Notification at top of new article editor

  1. Fill out the rest of the item as usual, and click Save when completed