Hi again fella, remember it might be safe to assume that if your fluid is low , you may have a leak somewhere.
Anyway, your fluid reservoir is on your pump and is usually most easily topped up using an old syringe or similar due to its poor access.
With your boot lid open you will need to remove the carpet section that goes up the side of the car to reveal the pump/res etc.
Open boot, look into right hand side, remove carpet panel, voila.
Good luck bud, may be a how to on the net somewhere

Stuart