Replace the ink cartridges once you receive the low ink or out of ink warning.
WARNING:
Use Pitney Bowes ink cartridges to ensure best printer performance. Other ink cartridges may cause: poor print quality, rejected/returned mail and uncovered service expenses.
The ink in the cartridge may be harmful if swallowed. Keep new and used cartridges out of reach of children. Discard empty cartridges immediately.
Do not remove the ink cartridge if the print head is not installed. If the ink cartridge and print head are removed at the same time, ink from the print supply line will flow down the tube and squirt from the needle in the ink cartridge holder out into the printer and system interior.
Open the ink cartridge cover.
Pull the ink cartridge straight out.
Remove the new ink cartridge from its packaging.
Hold the ink cartridge with the label facing upright and push into place.