Dell 5330dn Workgroup Mono Laser Printer - Manual (Page 9)

7. Insert and slide tray 1 back into the printer.
8. Set the paper type and size. See "Setting the Paper Type" and "For standard, Optional 500 Sheet Tray and HCF Setting Paper Size" .
Changing the size of the paper in the paper tray
The tray is preset to Letter or A4 size, depending on country specifications. To change the size, you need to adjust the Paper guides.
1. Push the back plate of the tray outwards completely so that the length of the tray can be extended.
2. Squeeze the paper length guide and slide it to the required paper size you are loading, which is marked at the bottom of the tray.
3. Squeeze the paper width guide and slide it to the required paper size. The sizes are marked at the bottom of the tray.
Improper adjustment of paper guides could result in paper jams.
4. Load paper with the print side down. For details, see "Loading Print Media" .