Charge each light in direct sunlight for at least eight hours before turning it on the first time.
Place the lights where they will receive at least eight hours of sunlight per day -- but away from other sources of illumination, which may prevent the built-in sensor from properly turning them on and off.
Push the mounting spike securely into the ground. Push the stake onto the spike. Push the light body onto the top of the stake.
Make sure the light is standing vertically so sunlight falls straight onto the solar cell on top of the lamp.
Turn on the automatic on/off switch. Test the light's function by covering the solar cell to simulate dusk and verify that the light turns on.