the rear brakes are adjusted through the adjuster hole in back of the backing plate on the bottom. the star wheel is suposed to only move one way but most including mine moves freely both ways as the teeth on the star wheel dont engage the clicker thing properly. If you over adjust the wheel and find it difficult to back off you can try to force it and it might back off... or a screwdriver to push the clicker thing away from the star wheel and then de-adjust. I adjust my brakes till I get just a light drag from the brakes when I spin the wheel while it's jacked up.

don't forget jack stands! seen a car fall on a guy adjusting his brakes... it was ugly.

hope that helps