Oki ES6405 User Manual page 79

Remove the new cartridge from its box but leave its wrapping
5.
material in place for the moment.
Gently shake the new cartridge from end to end several
6.
times to loosen and distribute the toner evenly inside the
cartridge.
Remove the wrapping material and peel off the adhesive tape
7.
from the underside of the cartridge.
Holding the cartridge by its top center with the colored lever
8.
to the right, lower it into the printer over the image drum
unit from which the old cartridge was removed.
79
– ES6405 User's Guide