This is usually because the Page Type is not created as a News Type.
  1. From the menu in the top left select School Website
  2. Navigate to Website Management > Websites
  3. Click the ellipses button and select Edit Website next to the desired Website 
  4. Click + Create Page
  5. Title the Page and Select the Page Type: News
  6. Select a Master Layout and select the Menu and a Parent Page if applicable
  7. Click Save and Close