Oki C610dtn User Manual page 87

5. Remove the new cartridge from its box but leave its wrapping
material in place for the moment.
6. Gently shake the new cartridge from end to end several
times to loosen and distribute the toner evenly inside the
cartridge.
7. Remove the wrapping material and peel off the adhesive tape
from the underside of the cartridge.
8. Holding the cartridge by its top center with the colored lever
to the right, lower it into the printer over the image drum
unit from which the old cartridge was removed.
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– C610/C711 User's Guide