Oki OKIFAX 5750 Service Manual page 238

Figure 2.5.2 Toner Cartridge Installation (2)
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Take out the toner cartridge from the damp proof bag, shake it five or six times as shown in the illustration to eliminate the toner deflection, and peel off the
seal gently.
Figure 2.5.3 Toner Cartridge Installation (3)
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Ensure that the plastic tab on the right-hand side of the toner cartridge recess lines up with the groove on the toner cartridge.
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Press down on both ends to make sure the cartridge is fully seated.