Insert a thin flat-head screwdriver into the top outer corner of the mirror so that the tip of the screwdriver is behind the glass. Push the glass forward until the outer pivot point is released.
Pull out the inner pivot point in the same way.
Unhook the drive rod using a screwdriver.
Remove the mirror glass.
Attach the new mirror glass to the drive rod.
Fix the inner pivot point.
Align the outer pivot point and press the mirror glass into the housing until it locks into place at the outer pivot point.
Precautions: When pressing the mirror glass, be sure to wear gloves or place a clean cloth underneath to avoid damaging your hands.