Your spark plugs are screwed into the head of the engine.
To remove the plugs you have to take this off
Then inside those four rubber boots are coils which touch the spark plugs.
Its basically four bolts and that thing is off. Then take your spark plug socket and extenstion and undo them carefully.
To put them in, take the new ones and PUT ANTISIEZE ON THEM. DONT FORGET THAT.
PUT ANTI SIEZE ON YOUR SPARK PLUG THREADS ! or else youll end up putting a crack in your cylinder head the next time you try and take out your spark plugs. Then turn them as much as you can and when it becomes tight, just do 90 degrees more and your all set.