You will need to remove the plastic intake cover (4 screws) and plastic ignition coil cover (2 screws and oil cap). This exposes the ignition coils. Unplug and remove all coils and the spark plugs are underneath. Once plugs are removed they should be inspected for deposits and fouling.
Make sure you use the proper plug for the vehicle, saving money on cheaper plugs will cost more in the long run. The spark plug gap on the new plug should be 1.0 - 1.1 mm
I'm actually glad you asked that. If reliant on your local parts store, they may end up directing you toward some specialty or gimmicky spark plug. Always ask for the OE spark plug (original equipment) if you don't already know the #.
Here are the factory part numbers:
NGK part # PZFR5F-11 ( their aftermarket # is 4363)