It's easy. If the retailer has a chip-enabled terminal, simply insert your chip card face up in the terminal. The chip card will remain in the terminal while the transaction is processed. To authorize your transaction, just follow the prompts as you do today.
You'll be prompted to enter your PIN or to provide a signature as you normally would to verify the transaction. You may not be asked for a PIN when travelling internationally. Your card is available to be removed from the terminal once the transaction is completed.