Instructions on Installing Safety 1st Child-Proof Locks for Cabinets
- 1). Press the release tabs on the square clasp on the child lock and pull the clasp completely off the u-shaped clamp.
- 2). Place the u-shaped clamp behind the knob handle on the left door and the right door on the cabinet so the ends of the clamp face to the right. If you have handles, slide one end of the u-shaped clamp through both handles.
- 3). Slide the ends of the u-shaped clamp though the square clasp, then slide the clasp to the left until it butts up against the right doorknob or handle. The clamp has teeth on it that secure the clasp in place.
Source...