Presuming you have the Intelligent Key feature, this is the one you need:
You cannot program the key yourself. You will need to take it (and the car) to a dealer or locksmith. They are spendy little beasts. Here in the states the cost for the key and programming runs anywhere from $150 to $300 USD.

You cannot program the key yourself. You will need to take it (and the car) to a dealer or locksmith. They are spendy little beasts. Here in the states the cost for the key and programming runs anywhere from $150 to $300 USD.