Buick 1993 Skylark Owner's Manual page 104

Outside Mirrors
I
To adjust the left outside mirror, rotate the knob located
on the driver's door. The right outside mirror must be
adjusted manually. Adjust each mirror so you can just
see the side of your vehicle.
If your Buick has the optional power mirror control, the
mi.rror control is located on the driver's door. Rotate the
control to the left or right to choose the mirror you want
to adjust. Then move the control in the direction you
want to move the mirror.
Adjust each mirror so you can just see the side of your
car and the area behind your car.