Samsung CLP 550 - Manual (Page 271)

I NSTALLING P RINTER O PTIONS F.13
F
Installing an Optional Tray
You can increase the paper handling capacity of your printer by
installing an optional Tray2. This tray holds 500 sheets of paper.
1 Turn the printer off and unplug all cables from the printer.
2 Remove the packing tape and the packing material inside
the tray.
3 Find the location of the connector and the optional tray
positioners.