How do you remove the passenger door panel to replace the outside mirror on a 2000 Mazda MPV?

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.

Neither Haynes nor Chilton has published for the 2000+ MPV. I could tell you how, it's not hard, I've had mine off numerous times, but it's easier for you to peruse this very forum. It's been asked and answered many times here.