I've never owned an HOB, but have to believe it's similar to all others.
I would start that with bubbles up to the neck. Let it run for a day or two and start to adjust accordingly. I like running fairly dry so I get a bunch of smutz in the neck, and typically clean after 3 or 4 days.
Set it so the foam is just below the cup and allow it to run a day or so. You should be getting foam into the cup. Lower for more skimming and wetter foam. Raise for dryer and less foam. You want a dark colored skimmate. Dark green or brown and smelly.