How do you install an ink cartridge on an HP Officejet 4315 All in one Printer that I have had given me, with everything but the instruction book. Can you also confirm that the cartridge numbers are 27 & 28 for this model and which is colour and which is black? Thanks!

Hi there,
Working with print cartridges
To ensure the best print quality from HP All-In-One, you will need to perform some simple maintenance procedures and when prompted by a message on the display replace the print cartridges.

A) Handle the print cartridges
Hold the print cartridges by their black plastic sides, with the label on top. Do not touch the copper-colored contacts or the ink nozzles.
Note : Handle the print cartridges carefully. Dropping or jarring cartridges can cause temporary printing problems or even permanent damage.

B) To replace the print cartridges
1) Make sure the HP All-In-One is off whenyou open the print cartridge door to access the print cartridges, the Hp A-ll-In-One will not release the cartridges for changing. You might damage the HP All-In -One. If the print cartridges are not docked safely on the right side when you try to remove them.
2) Open the print cartridge door.
The print carriage should now move to the far right side of the HP All-In-One. If the print cartridge does not move to the right side, close the door. Then trun the HP-All-In-One offm and then on again.
3) Wait until the print carriage is idle and silent, and then lightly press down in a print cartridge to release it.
If you are replacing the tri-color print cartridge, remove the print cartridge from the slot on the left.
If you are replacing the black print cartridge, remove the print cartridge from the slot on the right.
4)Pull the print cartridge toward you out of its slot.
5. If you are removing the print cartridge because it is low or out of ink, recycle the print cartridge.
6. Remove the new print cartridge from its packaging and, being careful to touch only the black plastic, gently remove the plastic tape by using the pink pull tab.
Caution Do not touch the copper-colored contacts or ink nozzles.
Touching these parts can result in clogs, ink failure, and bad electrical connections.
7. Slide the new print cartridge forward into the empty slot. Then gently push on the upper part of the print cartridge forward until it clicks into the socket.
If you are installing the tri-color print cartridge, slide it into the left slot.
If you are installing a black print cartridge, slide it into the right slot.
8. Close the print cartridge door.
9. If you installed a new print cartridge, the print cartridge alignment process begins.
10. Make sure you have plain paper loaded in the input tray, and then press OK.
The HP All-in-One prints a print cartridge alignment sheet.
11. Load the print cartridge alignment sheet print side down and top first in the center of the document feeder tray, and then press OK.
The HP All-in-One aligns the print cartridges. Recycle or discard the print cartridge alignment sheet.

Align the print cartridges
The HP All-in-One prompts you to align cartridges every time you install or replace a print cartridge. You can also align the print cartridges at any time from the control panel or by using the software you installed with the HP All-in-One. Aligning the print
cartridges ensures high-quality output.
To align the print cartridges from the control panel when prompted
1. Load letter, A4, or legal unused plain white paper into the input tray.
Note If you have colored paper loaded in the input tray when you align the print cartridges, the alignment will fail. Load unused plain white paper into the input tray, and then try the alignment again.
If the alignment fails again, you might have a defective sensor or print cartridge. Contact HP Support. Go to www.hp.com/support. If prompted, choose your country/region, and then click Contact HP for information on calling for technical support.
The HP All-in-One prints a print cartridge alignment sheet.
2. Load the print cartridge alignment sheet print side down and top first in the center of the document feeder tray, and then press OK.
The HP All-in-One aligns the print cartridges. Recycle or discard the print cartridge alignment sheet.
To align the cartridges from the control panel at any time
1. Load letter, A4, or legal unused plain white paper into the input tray.
Note If you have colored paper loaded in the input tray when you align the print cartridges, the alignment will fail. Load unused plain white paper into the input tray, and then try the alignment again.
If the alignment fails again, you might have a defective sensor or print cartridge. Contact HP Support.
2. Press Setup.
3. Press 6, then press 2.
This selects Tools and then selects Align Print Cartridge.
The HP All-in-One prints a print cartridge alignment sheet.
4. Load the print cartridge alignment sheet print side down and top first in the center of the document feeder tray, and then press OK.
The HP All-in-One aligns the print cartridges. Recycle or discard the print cartridge alignment sheet.

Black Cartrige no . :27/21
Tricolor Cartridge no . 22

Hope this helps.
have a good day.