erm you can pump air into the two air valves under the red topcaps shich should make them as hard and as soft as you like, but if you lower them it will compress the springs so it will allso make them harder.
i know about the valves, but when i first got the forks i put like 30 psi in them and the valve's blew, sent them off, same thing happened then i was told by the people whio repaired them you can only put 15 psi in each side before they'll blow