HP Designjet 111 Printer Series - Replace ink cartridges

Open the front hinged flap at the right of the printer.

Gripping it by its shorter top edges, lift the ink cartridge vertically up and out of the printer.

Lower the new ink cartridge into its slot until it clicks into place and is quite secure.

Repeat the preceding two steps for each ink cartridge that you wish to replace.

Close the outer flap.