Koni adjustable shocks--how do you adjust them?

[mrdonut12]

I took everyone's advice, bit the bullet, and ordered new Koni
shocks from Bluebird.
They arrived today, are huge, and there's no instructions
in the box, although the side of the box says to read the
instructions. ;o)
I can easily twist them and don't feel any resistance.
There are no markings on the outside of the shock, except for
one arrow that indicates "up".
How do I adjust these things? I want the firmest setting,
per Jeff Miller.

Thanks,
George Witt
81 FC 35
Lincoln, Nebraska