Most parts stores for foriegn cars will advise you on this, but in my experience the pump/reservoir assembly may have either a cap on it or it may use a reservoir mounted on the firewall or either side that looks like a slave cylinder reservoir. it should be marked somewhere for power steering only..this reservoir may have a cap thats removeable and the full line will be visible on the outside of it, with power steering fluid only, fill to line..in exrteme cases, there is a hose that comes up to a cap somewhere(usually these types of refill setups are rare because it confuses the owner)where the fluid gets added, I have seen so many different styles of refil setups, so it just depends on which is used by the manufacturer of the car..be careful not to mix fluids as this will not help your situation..brake fluid wont mix with power steering fluid so just be warned..