How do you fix a power steering leak for cheap?

What is your question?

The fluid is leaking out from a part about 5 inches below the reserve opening. I can see it leaking out when the car is running. Even more so when the steering wheel is turned. I go through about a quart every 10 - 20 miles. The part that's leaking looks like a small metal cup with a lid and a screw on top. I'm sorry I don't know my cars, so any educated guess would help. Thank you!