Lower the rear with lowering blocks. The front has longitudinal torsion bars. Follow them toward the rear and at the end you'll see the adjusting bolts. Break loose the lock nut and loosen the bolts equally on both sides (try about two turns to start). Put it back down on the ground and move it to settle the suspension and you'll have a starting point. Adjust from there to reach desired height. Make sure you always adjust them equally.
Thanks for the pic, jedimario.
"Everybody believes in something and everybody, by virtue of the fact that they believe in something, use that something to support their own existence."
Frank Vincent Zappa, 1940-1993