I am assuming that you have the base model with rear drum brakes and the parking brake handle inbetween the seats?
Please let me know if this is the set-up that you have...
The are 2 ways to adjust your parking brake.
The cable portion of the system is adjustable by applying and releasing your parking brake handle 4to6 times.
If this is not enough adjustment, You will need to remove the rear brake drums and adjust the rear brakes. This will also tighten your parking brake...