Dell S2810dn User Manual page 250

2 Hold both sides of the drum cartridge with your hands, insert the drum cartridge into the cartridge slot, and then
push it in halfway.
3 Grasp the handle on the front of the drum cartridge, and then push and install the drum cartridge until it stops.
4 To remove the toner cartridge from the old drum cartridge, grasp the toner cartridge lock lever, and then raise it
upward to unlock.
5 Grasp the handle on the toner cartridge, and then pull it out of the old drum cartridge.
WARNING:
Do not shake the toner cartridge. This may cause toner spills.
WARNING:
Keep the removed toner cartridge on a level surface.
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Maintaining Your Printer