You probably have self adjusting brakes (my '86 CRX had them until I swapped them for discs)
To adjust these you will simply need to drive the car in reverse and press the brake firmly several times. After doing this you will then need to adjust the E-brake. This is done by lifting the rear of the car and pulling the E-brake up 1 click, then tighten the cables untill the brakes just start to grab.