Oki ES 1624n MFP User Manual page 19

Fan the paper to be loaded at the edges (1) and in the middle (2),
2.
then tap the edges of the stack on a flat surface to make it flush
again (3).
1
Load paper print side down, making sure the rear stopper (1) and
3.
paper guides (2) are snug against the paper.
2
Loading Paper • 19
3