Twist the knob that's located on the turn signal lever. This lever can be found on the Left side of the steering wheel.
The switch on the left should always be left on A (Auto) as shown.
This means that the headlights would turn on whenever it gets dark. It will turn off automatically when you drive into a bright area.
To activate a quick flash of the high beam, pull the same lever towards you. To keep it on, push it away from you.