yea its in the ebrake handle. take the plastic cover off and look down it when its not pulled up. if you can't get enough adjustment that way you gunna have to mess with the cables in the rear attached to the calipers. once you look at it you can figure it all out.
before you go messing with the cable you should try adjusting the rear calipers. Remove the bolt that covers the allen screw that you use to adjust the piston. When I did my breaks about a month ago I found that at first I left it too loose and the ebrake wouldn't engage. I had to adjust the piston to the point where I could no longer turn the rotor with one hand and then I backed off slightly (like a 1/3 of a turn of that allen screw). At first I had adjusted the piston only to the point where the pad just touched the rotor. Guess what, I put the car back down and tightened the lug nuts only to have the car roll forward with the ebrake on. The second attempt adjusting to the point of not being able to move the rotor and then backing off did the trick. I didn't have to touch the e-brake cable. Good luck
Just make sure that the e-brake is disengaged when you adjust the rear brakes. I did pads on mine recently, and I forgot that the e-brake was on when I adjusted them. It caused the e-brake to drag, even when it was fully disengaged. Easy fix.
i got my kit from planet miata, cheep but i wasent to stoked with the service. wen i got the box it was filthy and all riped up. surprised some of the stuff didnt fallout. also they only gave me front brake hard wear but not the rear