Dell 3100cn Owner's Manual page 16

Insert the print media into the feeder with the recommended print side face up.
3.
NOTE:
Do not force the print media.
Slide the width guides until they rest lightly against the edge of the print media stack.
4.
NOTE:
Be careful not to bend the print media.
Make sure the size and type settings for the multipurpose feeder are set to the correct value
5.
for the print media you have loaded.
Select print media source, size, and type in your software program and select the print media
size and type on the printer operator panel.
For tips on recommended print media, solving printing problems, and clearing jams, see the
Guide
.
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User's