Instructions
Wait until your opponent places down a trap card.
Place down a counter-trap card during your turn that has the ability to negate the activation of your opponent's trap card. Or if you have a spell card that can destroy trap cards you can use it during your turn or after the opponent's trap card has been activated.
Use your counter-trap card or spell card when your opponent attempts to activate his trap card. If using a counter-trap card, be ready to pay whatever the activation requirement is, usually sacrificing a monster card or health.
Negate or destroy your opponent's trap card and he will have to remove it from the game.