Machine reservations are windows of time in which a given machine is scheduled for use, indicating to your co-workers that it will not be available for that date.
These reservations appear on your company calendar and can be scheduled two different ways:
1. By clicking "Add reservation" directly from your calendar; or
2. By navigating into a given machine's details page (via Resources → Machinery → Options → Edit) and navigating to the "Reservations" tab. From here, you can view all past and future reservations, as well as schedule new reservations.