Samsung MultiXpress X422x Series Administrator's Manual page 52

Loading paper in the tray
3 Load the paper with the side to be printed on facing down. 4 Squeeze the multi-purpose tray paper width guides and adjust them to
the width of the paper. Do not force too much, otherwise the paper will
bend resulting in a paper jam or skew.
5 When you print a document, set the paper type and size for the multi-
purpose tray (see "Media sizes automatically detected" on page 53).
For information about setting the paper type and size on the control
panel (see "Tray Settings" on page 59).
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2. Media and tray