This guide will assist you in replacement of the Lenovo Thinkpad Edge E520 keyboard. You will require a Phillips head screwdriver for this replacement.
There are two screws that have keyboard symbols pointing at them.
Unscrew the screws with a 3.175 mm diameter and 6.35 mm length with a Phillips head screwdriver.
Turn the laptop back over so that the keyboard is facing you.
Use your hands to separate the keyboard from the laptop