Dell 1250c Color Laser Printer - Manual (Page 41)

Loading Paper 39
11 Insert the paper cover into the printer and then align the paper cover to
the marking on the paper tray.
12 Select the paper type from the printer driver if the loaded print media is
not standard plain paper. If a user-specified print media is loaded in the
MPF, you must specify the paper size setting by using the printer driver.