Samsung SF-530 Series - Manual (Page 136)

5.9
Maintenance
5. Find the cartridge slots inside the machine, one on each side. Grasp
the handle and slide the cartridge down between the cartridge slots
until it drops into place.
4. Shake the cartridge from side to side 5 or 6 times to distribute the
toner evenly inside the cartridge.
6. Close the cover firmly until it snaps closed.