How do you replace the powered driver's side mirror on a 96 Mazda 626?
The question you ask is too involved for a proper answer. You may want to go to a car parts store, or book store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
In the corner of the window is a black plastic triangle. Take a flat head screw driver and pop it off. It has some plastic tabs that hold it on. Then you will see 3 screws. Unscrew them. Rock the mirror assembly with your hand and it should fall off. You will then notice a connector for the mirror motor. Disconnect it. Replace in reverse order.