To be absolutely certain, you should:
* Consult your owner's manual: This is the best source of information for your specific vehicle. The manual will have diagrams and instructions.
* Look closely at the bottom of the radiator: It's usually a small, easily accessible plug. It may be a threaded plug or a plastic cap.
Remember to place a drain pan under the radiator before opening the plug to catch the coolant. Coolant is toxic, so handle it carefully and dispose of it properly.