Wee dial at the bottom is the rebound adjuster- it alters how fast or slow the fork returns to the fully extended position. Too fast and it'll buck about and not respond to bumps properly, too slow and it'll stay down and you may as well have a rigid fork. There is a range of useability nearer the slow end (should be a picture of a tortoise on your fork!)- try 2 360 turns back from the fully slow setting and work from there.
You also need to asjut the air pressure for your weight- you should find some pressures in the manual, somewhere. There'll be an air cartridge on one of the legs, not sure with the travel adjuster fork where it is but I'd assume on the bottom, on the side opposite the rebound. A shock pump should have come with your bike (if not, go back to the shop and ask for it), and use that to pump it to a pressure near that in the manual and see if it feels good. If it's too hard, let some air out. If it's too soft put more in.
That should see you right.