Front rebound is the brass slot headed things that are sticking out of the top of the forks. Compression is reached via a small screwdriver up the bottom of each fork leg (assuming the previous owner has put the wheel spindle back in the right way)
The ST2 has the same adjustments on the front as the 4 and the 4S i think, my old one certainly did.
You can download the owners manual from
www.ducati.com if you want.