Samsung SCX-8240NA-CAS - Manual (Page 43)

Media and tray_ 43
5. When you print a document, set the paper type and size for the
multi-purpose tray.
The multi-purpose tray can automatically detect various-sized paper
(see "Media sizes automatically detected" on page 44).
For information about setting the paper type and size on the control
panel (see "Tray setting" on page 47).
The settings made from the machine driver override the
settings on the control panel.
To print from an application:
a) Open an application, and start the print menu.
b) Open Printing Preferences (see "Opening printing
preferences" on page 140).
c) Press the Paper tab in Printing Preferences, and select
an appropriate paper type, size, and source.
d) Press OK.
e) Start printing from an application.