As a group admin:

  1. Navigate to the group's schedule
  2. Click "Edit" next to the game you want to change.
  3. Select date on the calendar
  4. Select start and end times
  5. Click "Save"
  6. Warning: Avoid changing a game's date/time after the invitation emails have been sent, as new emails will not be triggered and members may be confused Also, game type cannot be edited.