Locate the seven pedals on the bottom of the harp. When the pedals are in the middle position, they play a natural pitch; when they are in the highest position, they play flats and the lowest position will play sharps.
Learn the names of the pedals from left to right. The three pedals on the left side control the pitches D, C and B. The four pedals on the right control the pitches E, F, G and A.
Adjust the pedal that corresponds to the pitch you wish to change. To play an E-sharp, adjust the corresponding pedal to the lowest position by pushing down with your foot. To play E, make sure the pedal is in the middle position. To play E-sharp, use the toe of your foot to push the pedal to the top position.