Instructions on using world travel adapter kit

• Apple World Travel Adapter Kit - Apple Store
• About Apple World Travel Adapter Kit - Apple Support

The support document you came from has the instructions on how to use it.

What more do you need to know?

You just need to plug in the proper prong end to the power connector for your device.

Do you have a specific question about it?

What device or charger are you trying to use it with?

it's just a plug changer as in having some metal sticks be a bit different in shape