HP 1100dtn - Manual (Page 52)

4-2 ENWW
To replace an ink cartridge
1 Turn the printer power on, and then lift the printing supplies cover.
2 Remove the ink cartridge that requires replacement by grasping it between your thumb
and forefinger and pulling it firmly toward you.
3 Insert the new ink cartridge into its own color-coded slot.
4 Press down firmly on the new cartridge to ensure proper contact after installation.
5 Close the printing supplies cover.