How do you install a toner cartridge on an HP LaserJet 2015? -

Where does the toner go and how do you install it? Does anyone know how much these cartridges cost too?

You pull down the cover on the top front of the printer take out the old cartridge then put in the new one removing all the plastic seals also there will be a pull tag on one side which will pull out a long plastic strip then it should print