There are two sets of adjusters:
The first is part of the brake shoe expander mechanism in the rear drums. Take a few photos as you remove the bits so you know how to put it back together again.
The other adjuster is to take up the cable slack. It's under the centre (handbrake lever) console. One of the screws is concealed by a plastic flap near the base of the handbrake lever. The others are in the cupholders.
It's best not to fiddle with the cable adjuster if you haven't first cleaned and adjusted the drums.