Oki B4400 Series - Manual (Page 50)

B4400/B4600 User’s Guide – Paper recommendations > 50
3. Press the Item (+) or (-) button until MEDIA TYPE or
MEDIA WEIGHT for the required tray is displayed.
4. Press the Value (+) or (-) button until the required paper
type or weight is displayed, then press the Select button.
A plus (+) appears next to the selected paper type or
weight.
5. Press the Online button to return the printer back to
online status.
Select the correct paper settings in the printer driver before
printing the file.