To put ink in your HP Envy 7800, start by turning on the printer and opening the ink cartridge access door. Wait for the carriage to move to the center. Locate the cartridge you need to replace and gently press down to release it, then pull it out. Unpack the new cartridge, removing all plastic tape without touching the copper contacts or ink nozzles. Slide the new cartridge into the ... https://123hp-setup-com.us/blog/how-do-i-put-ink-in-my-hp-envy-7800/