Turkey baster or syphon the old out, then add new.How do you flush the power steering fluid? I have searched but can't find instructions on how to do so.
The other way is to disable the ignition (fuel pump fuse), have someone crank the car with the wheels off the ground while they turn the wheel from end to end. Disconnect the return line to the PS tank, extend it into a bucket. Do not allow it go go dry. Add about 2-3 quarts of fluid, or until its clean red.