Pitney Bowes DMI100i Operator's Manual page 50

Maintenance
8. Remove the new print head from packaging.
9. Remove the protective tape or the black cap from the bottom of the new print head.
10. Squeeze the two gray tabs on either side of the new print head and slightly angle the print head
while pushing the print head flush against the wall.
11. Replace the ink cartridge, see
Pitney Bowes Operator Guide
OR
Replacing the Ink Tank Cartridge
September 2023
if you need assistence.
50