Pitney Bowes mailstation Operator's Manual page 84

Maintenance
d. Lift the control panel and locate the ink cartridge (see ink cartridge in white circle on image).
e. Press the unlock icon to open the ink cartridge latch as shown in the image.
f. Tilt the old ink cartridge toward you and lift it out. Discard the old cartridge.
Pitney Bowes Operator Guide January 2024 76