Turn off the engine.
 

Pull the hood release lever under the dashboard.
 

Walk around the front of the car, reach under the hood, find the latch and squeeze it. As you squeeze the latch, open the hood.
 

Find the windshield wiper fluid reservoir, usually a plastic jug filled with blue windshield washer fluid. It has a hose leading toward the windshield. Take care not to confuse it with the coolant reservoir, which may look similar. The coolant reservoir will have a hose that connects to the radiator.
 

Flip open the top of the reservoir.
 

Add fluid if the fluid level is low - less than three-quarters full or below the fill line printed on the jug. Fill it to the top.
 

Close the reservoir lid and the hood of the car.

Source: www.ehow.com