Lexmark CX625
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.
Adjusting the paper guides and specifying the paper type can prevent paper from curling after it is printed on.
Do you experience recurring paper jams? Load paper properly and check if the printer detects the correct paper size.