To install a toner cartridge, follow these steps:

1. Open the front cover of the printer.
2. Pull out the old toner cartridge and dispose of it properly.
3. Remove the new toner cartridge from its packaging and shake it gently to distribute the toner evenly.
4. Align the new toner cartridge with the slots inside the printer and slide it in until it clicks into place.
5. Close the front cover of the printer and print a test page to check the quality.