Lexmark W812 User Reference Manual page 27

5
Make sure the paper fits easily under the two corner bucklers.
6
Replace the tray cover.
7
Insert the tray.
Note: Do not exceed the maximum stack height indicated on the tray.
If you have frequent paper jams, try loading the paper to the lower stack height line.
8
Select the paper type and paper source from both the operator panel and your software
application.
Note: If you installed an optional 500-sheet paper tray but are unable to select it from your
printer driver, select the printer configuration or installed options tab in your printer
driver and highlight the 500-sheet tray option, which tells your computer an optional
tray is installed.
9
Press to start your print job.
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