Mazda 3 Sedan 2020 Owner's Manual page 478

Maintenance and Care
Owner Maintenance
2. Remove the stopper and raise the
wiper arm.
3. Firmly rotate the wiper blade to the
right until it unlocks, then remove
the blade.
CAUTION
To prevent damage to the rear
window, do not let the wiper arm
fall on it.
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4. Pull down the blade rubber and
slide it out of the blade holder.
5. Remove the metal stiffeners from
the blade rubber and install them in
the new blade.
CAUTION
Do not bend or discard the
stiffeners. You need to use them
again.
6. Carefully insert the new blade
rubber.
Then install the blade assembly in
the reverse order of removal.