Samsung SF-755P - Manual (Page 204)

A PPENDIX A.3
A
4 Place the machine over the tray, aligning the feet on the
machine with the positioners of the tray.
5 Plug the interface cable of the tray into the Tray 2 cable
connector on the back of the machine.
6 Load paper in the optional Tray 2. The instructions for
loading paper in this tray is the same as you would when
loading the standard paper tray. See page 1.11.
7 Reconnect the power cord and cables and then turn the
machine on.