Power steering fluid is leaking from the cap of Hyundai 2002 Accent . How do I fix it or do I need a new cap?

did you overfill the fluid resovior? the cap is vented and provides no seal, so if the tank is overfilled it will bubble out the cap, if the tank is not overfilled you have a defective steering rack that is pulling in air through a defective seal and causing the fluid to foam and bubble out the cap vent.