Step 1 - Turn off your iPhone.
Step 2 - Hold down the home button and plug your iPhone into a computer.
Step 3 - Keep holding down the home button until you enter recovery mode.
Step 1 - Hold down the home button and the lock button at the same time.
Step 2 - Keep holding them down until you see the Apple logo then release the buttons and you should be finished!
If you have any questions then please comment