Spanish version of the article is available at the link.
To create a pre-order (future order) via dispatch panel first of all make sure that this feature is enabled. Proceed to the company panel "Service Types" tab and check the status of pre-orders feature (Instant or Delayed broadcast should be enabled)
Now while creating an order via dispatch panel simply click on the date&time's field and choose the details of pre-order.
Pre-order can be done from 30 minutes in advance.
"Clock" is a special sign for pre-orders in dispatch panel.