Remove the power steering return hose from the reservoir and put the end of the hose into an old jug or big jar and start the car, this will drain the power steering fluid, top up the reservoir as you do this, it might make a noise while your doing it, when you see fresh fluid starting to come out turn off the engine.
Then reconnect the hose and start the engine and slowly turn the steering from lock to lock several times, this is to bleed the system. This is how i have done it in the past, someone else might have a better way of doing it.
Think ive said that right.
Go to ford and ask for the correct fluid, or use fluid to ford spec WSA-M2C 57-A.
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Fiesta ST200, K&N Panel Filter otherwise standard for now.