Look at the steps on the collar, the taller the steps, the stiffer the spring. I've set mine at 35mm sag.

 

That's what I've thought and done - and that effectively is turning counterclockwise (as you look from rear to front) to stiffen, creating TALLER STEPS which in turn compresses the spring. Thanks.

Seems like they could have explained that better, but oh well.

 

Welcome gmerri,

When the spring is set fully counterclockwise it is at the weakest (softest) setting. When the spring has been set 10 turns (steps on the preload adjuster) the spring is at the strongest (stiffest). You have the right idea, and you have done it correctly. All the following notes assumes you are in the normal weight range. I weight in at 100kg and ride pretty quickly on rough roads and the standard spring struggled. weight range for the standard spring is 70 - 90kg (155 - 200lb)

Be aware that stiffer is not always better .. well for motorcycle suspension anyway lol!! Measure how far the seat drops when you sit on the bike, fully kitted in your ride gear. You will need the help of an extra pair of hands and eyes. Keep adjusting the spring preload until the "sag" is 2" - 3" (50 - 75mm). Then adjust the rebound tension so that it is in about the middle position.

Go for a ride on a typical section of road you ride on. Have a screwdriver handy. Ride a few miles / kilometers and adjust the rebound , about 1 full turn at a time, until you get a smooth ride. The stiffer settings will give you a harsh ride on small bumps, corrugations and the like. This is because the spring cant rebound fast enough to complete the full stroke and absorb the shock before hitting the next bump. The softer rebound settings will result in a bouncy, trampoline like ride, because the spring rebounds too quickly. Different riders prefer different ride characteristics, different road types result in different ride characteristics and same with different weight riders.

Keep at it though and very soon you will have a bike that rides just the way you want it to.

 

The second page may be referring to damping adjustment.
You can not turn the spring adjuster 10 turns
Cheers