(If you need help creating and sending a message, click Here)
You can use this option to schedule announcements/discussions for a future publish date. To do this, notice the new option at the bottom of the New Message screen.
Once the checkbox for "Schedule/post message automatically" is selected, the blue button "Post Message" is removed and only the "Save Draft" button remains.
When the date and time for the scheduled message is filled, selecting "Save Draft" will save the message and post it at your selected date/time.