From the control panel, navigate to:
Settings > Paper > Tray Configuration > Paper Size/Type > select a paper source
For non-touch-screen printer models, press to navigate through the settings.
Set the paper size and type.
Find out how to prevent paper from getting stuck in the printer.
Are the margins wrong on your printed page? Check the positions of the paper guides in the tray and specify the correct paper size in the computer or the printer.