How do I install ink cartridges in my HP DeskJet 3755 printer?
Open the cartridge access door, then lift and slide open the carriage cover to load or replace an ink cartridge. To insert a new cartridge, pick it up by the colored stripe and gently rock it back and forth five times. Push down on the cartridge until it clicks into place.
From the official HP Deskjet 3755 All-in-One Printer manual, page 2
Have a follow-up question?
Answers from the official manual.
Common questions