One of the most useful functions of the Dashboard is the ability to schedule a post for a specific time. In order to use this feature, there are a couple of changes that need to be made to your post.
The first step is to create the post that you would like to send out and designate the services to which it will be posted.
That button will display a dropdown menu with the default setting being "send now" or "submit for approval" if a review process is in place.
Select one of the other options in that menu and you will see other changes on the screen, most notably the send button is changed to a schedule button.