HP Photosmart 7150 printer- how do i change ink cartridge? was given printer and new ink- help soon please!?

My brother gave my the HP 7150 Photosmart printer when he got a new one for his birthday. He also gave me a new ink cartridge for it as it was out of ink. I have looked all over the thing (I am legally blind, too!) and cannot see where the old one comes out and the new one goes in! I need desperately to print something today and need to change that cartridge! Help ASAP please! Thanks!HP Photosmart 7150 printer- how do i change ink cartridge? was given printer and new ink- help soon please!?
1 If the printer is off, press the POWER button on the printer鈥檚


control panel to turn the printer on.


2 Open the top cover. The print cartridge cradle moves to the


center of the printer.


3 Lift the cradle latch of the print cartridge you want to install


or replace by placing your finger under the number on the


latch and pulling out. The print cartridge latch will pop


open.


4 If you are replacing a print cartridge, slide out the old print


cartridge and recycle or discard it.


5 Take the new print cartridge out of its package.


6 Grasp the pink tab and gently peel off the plastic tape.


Make sure you remove only the clear tape from the nozzles


and leave the copper contacts.


Do NOT touch the ink nozzles or the copper


contacts. Touching these parts may cause print


cartridge failure.


7 Insert the print cartridge:


鈥?Hold the print cartridge so that the copper contacts will


go into the printer first. Line up the ridges on the left


and right sides of the top of the print cartridge with the


grooves on the inside of the print cartridge cradle.


Carefully slide the print cartridge into the cradle, then


firmly push the cartridge in until it stops.


鈥?Lower the cradle latch. Place your finger on the top of


the latch. Place your thumb under the number on the


latch and hold it forward while pushing the latch down.


Release the latch to lock the print cartridge into place.


8 Close the top cover.