Samsung ProXpress SL-M3320ND/XAA User Manual page 37

Media and tray
Tray 1 / optional tray
1 Pull out the paper tray.
2 Squeeze and the paper width guide and paper length lever to locate
them in the correct paper size slot marked at the bottom of the tray to
adjust to the size (see "Tray overview" on page 35).
3 Flex or fan the edge of the paper stack to separate the pages before
loading papers.
4 After inserting paper into the tray, squeeze the paper width guides and
paper length guide.
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2. Menu Overview and Basic Setup
37