With the ignition on and the engine stopped, lower the windscreen wiper stalk lever completely: the windscreen wiper will stop before reaching the bonnet. Raise the windscreen wiper lever 3, pull tab 2 (arrow A) and move the blade upwards.
Slide the brush onto the lever until it clicks into place.
Check the reliability of the attachment of the brush to the wiper arm. Set the wiper switch lever to the off position.