WARNING: This page is about a different car, the 2021 Audi e-tron Quattro and 2019 Audi e-tron Quattro. However, it is still accessible from the selected car via links, so may be relevant.
-- Lift the windshield wiper arm off the rear window.
-- Pull the wiper blade -1- downward out of the wiper arm -2- in direction of -arrow-.