In The Optional Tray - Samsung SCX-6x45 Series User Manual

2 Remove the jammed paper by gently pulling it straight out.
Once you remove the jammed paper here, open the side cover and
then close it to clear the error message on the display.
If there is any resistance, and the paper does not move immediately when
you pull, stop pulling. Then:
3 Open the side cover.
Note
Do not touch the shiny drum cartridge surface. Scratches or
smudges will result in poor print quality.
4 Carefully remove the misfed paper in the direction shown.
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5 Close the side cover and insert the paper tray. Lower the rear part of
the Tray to align the rear edge with the corresponding slot of the
machine, then insert it completely.

In the optional tray

Note
This part explains the method of removing the jammed paper in
the optional tray 2. Please refer to the next method for other
optional trays, since the method is same as the tray 2
1 Pull out the optional tray 2.
2 Lift the front part of the tray slightly up to release the tray from the
machine.
If the paper does not move when you pull, or if you do not see the
paper in this area, stop and go to step 3.
11.3
<Troubleshooting>