Oki ES 1624n MFP User Manual page 74

Note the positions of the four cartridges: Cyan (1), Magenta (2),
2.
Yellow (3), Black (4):
Pull the colored toner release lever on the cartridge to be
3.
replaced (here we are showing replacement of the black toner
cartridge) towards the front of the printer.
Lift the right-hand end of the cartridge and then pull the cartridge
4.
to the right to release the left-hand end as shown. Remove the
Replacing Consumables • 74