Loosen all screws of the hangers along the frame which hold the saddle cable.

Bring the front end with the switch to the bar by pulling it through the hangers along the frame. Take care of the other cables around your bar.

Position the lever on the right side of your bar and tighten it's screw loosely. Bring it into a comfortable position for your riding stance and tighten its bolt with the torque wrench to 5-6 Nm.