Remove the fluid hose from the power steering pump going into the reservoir - that's the return line. Route this line over to a bucket (may need to remove the intake so the bucket has a place to sit). Cap the nipple on the reservoir to avoid spillage. Have someone start the car. You need to keep pouring ATF into the reservoir while the pump is pumping old fluid back into the bucket. It will happen fast, so be ready.
If you get (or already have) air in the system, raise the front of the car to get both front wheels off the ground. Start the car and turn the steering wheel back and forth full right, then full left, waiting approximately 3 seconds at each extreme. Having the wheels on the ground is too much strain on the pump when fluid has been run out.
Warnings: Do not overfill the reservoir!! Make sure it's at the proper level! Also, if you get fluid shooting out of the reservoir, you have air in the system. Slowly and carefully get it out by turning the wheels back and forth several times. Too much air in the system will cause power steering pump failure.
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