Instructions
Bring the Kettler tricycle to a complete stop. Go to the front of the trike.
Align the front wheel so it is straight out from the tricycle.
Push down on the rectangle-shaped button on the front of the head tube on the tricycle. This locks the front wheel so the tricycle only has a +/- 3 degree range of turn or front/back movement.
Push up on the button to release the wheel lock and regain the tricycle's full range of movement.