How do I install the toner cartridges in the HL-3450CN?
Rock the toner cartridge 3 to 4 times, pull off the tape labeled 'REMOVE,' and remove the orange protective cover. Install the toner cartridge by sliding it into the correct guide, matching the cartridge color label to the corresponding label on the printer. Repeat these steps for all remaining toner cartridges, then close the front cover.
From the official Brother HL-3450CN Color Laser Printer manual, page 1
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