Not trying to be sarcastic, just helpful, think about what you are trying to achieve, ie you want a greater distance between the suspension arm and the car body.
The spring is taking the whole weight of the car, this won't alter, so the spring is going to stay the same length, thus as the spring is pushing the car body up it needs to be higher to lift higher as the spring length remember is fixed, so as the collar on the strut faces you, you would need to turn the c spanner to the right, or counter clockwise, if you were viewing from above, make sure you give a good spray, and see if there are any locking plugs in the collar, there usually is, undone with allen key(5mm I think).
Don't worry about getting it pro set height wise, set with a ruler.
The idea of coilovers is so you can corner weight the car if you want to go to the extremes for grip/handling, this is done by putting each wheel on a scale to read the weight of the car at that corner, then if one was slightly lower than the adjacent one, "weight" could be added to the corner by adjusting the coilover(moving spring seat up), of course weight never alters but the way the car sees it does.
Saying that most just get them for the ride heigt adjustability, as you are doing.
tabetha