the side rear ones? open the door, where the window is, theres a plastic cover with 2 screws, take this off, under it are 2 bolts, inside the car where theres the lever thing to open them, theres a plastic cover over where it connects to the car, remove that with a screw driver and under it is a bolt, do the 1 bolt in the car first then the 2 near the door so you can hold the window
and thats only if a 3 door! i presume so cos on 5 doors there 4 rear side windows and you said 2, hope i was right lol