Different cars require different procedures of changing the front wiper arm, however, generally, it is done in the following said manner,Loosen the wiper arm retaining nut, then take note of the position of the wiper arm and lift it off the wiper arm driveshaft, and the installing of the new wiper arm is done in an inverse way. In the case of the rear wiper arm, with a small screwdriver one can pry the wiper arm retaining nut cover and after taking note of the arm's position, remove the arm, and the retaining nut and lifting the arm off the car ,while the installation process is as follow a reversal of the removal process.