Samsung ML-2151N-XBH - Manual (Page 29)

2.8 S ETTING U P Y OUR P RINTER
4 Pay attention to the paper limit mark on the left inside wall
of the tray. Paper overloading may cause paper jams.
N OTE : If you want to change the paper size in the tray, refer to
“Changing the Paper Size in the Tray” below.
5 Slide the tray back into the printer.
Changing the Paper Size in the Tray
If you load long paper in the tray, you should adjust the paper
guides to the paper length.
1 Push the back plate of the tray outwards completely so that
it can extend the length of the tray.