This guide will show you how to remove a broken or malfunctioning pedal and replace it with a new one.
First take an 8 in adjustable crescent wrench and fit it around the base of the pedal.
To unscrew the chain side pedal twist the the wrench counter clockwise.
To unscrew the pedal that is on the side away from the chain, twist the wrench clockwise.
Continue turning the wrench until the pedal detaches from the crank arm.