changing the power steering fluid on a vw caddy 1.9 sdi
VW Caddy III Van (2KA, 2KH, 2CA, 2CH)

How? You forgot to link the tutorial.

There is nothing complicated, first, we pump out the old liquid from the tank, then we can remove the tank and rinse it if necessary, then we turn off the return hole on the tank and attach the supply hose to the tank, raise the front of the car a little on both sides, pour new fluid into the tank, turn the steering wheel in both directions until new liquid comes out of the return hose, after that we attach the return hose to the tank, fix the tank, add liquid according to the level and you’re done.