Mercedes-Benz CLA Operator's Manual page 122

Windshield wipers
120
Position new wiper blade : with recess B
X
on lug A.
Fold wiper blade : in the direction of
X
arrow = onto the wiper arm, until retaining
clips ; engage in bracket ?.
Make sure that wiper blade : is seated
X
correctly.
Fold the wiper arm back onto the wind-
X
shield.