To replace printing paper all that is required is putting the paper into the enterance of the printer.
To replace toner cartridges the first step is making sure that the machine is turned off, then opening the frount cover.
The second step is removing the toner cartridges out of the drum unit assembley from the machine.
The third step is to push the green lock lever and take the toner cartrige out from the drum unit.
The forth step is to put the new cartriage into the drum unit and install it back into the printer.