the rear brakes are the only ones that adjust this is done by raising the car and suport it properly.
You will find a slot in the near the bottom of the backing plate of each wheel using a screw driver or adjuster spoon thru the backing plate move the adjusting wheel up or down untill you you notice a slight drag when turning the tire repeat on the otherside and then road test
Caution; Do not over tighten the brakes as this will cause them to overheat or lock up and it could be diffacult for a novice to back the brakes off again.