Dell 5330dn - Workgroup Laser Printer B/W User Manual page 54

8. Slide the stacker into the slots on the Output Expander. For easy insertion, ensure there is contact between the
rib on the stacker and the top edge of the Output Expander.
9. Flip the Output Expander stacker down.
10. Reconnect the power cord and cables to the printer and power on the printer.