Oki FAX 740 - Manual (Page 59)

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8. Place your thumb on the loading tab and your finger
behind the top of the cartridge, then gently squeeze the
tab and cartridge together until the ink cartridge snaps
into place.
NEW INK? Y/N
10. Press [YES] or [NO] as appropriate.
11. Run a nozzle test to check the print quality.
9. Close the top cover, pressing down firmly to lock it
down.