How to edit the zipcode of a whole city or region?

i have a question, how do i change the zipcode of a whole city in openstreetmap. My area of interest is San Felipe, Baja California. I don’t want to individually select each street and add the addr:postcode tag. is their a way to select a whole region in openstreetmap and change the zipcode to 21850. for some reason its showing a 21709 zipcode. this zipcode was used in the 70’s and its outdated.

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