Screws to remove the window are in the black frame(mine is black anyway)on the inside side of the door. Just unscrew them and the window will come out. A small piece of advice, however. Have someone brace the window from the outside as you are removing the frame. Don't ask my why!!
I don't now if you have a long window or the shorter one like we do but it is really no problem to remove or put back in especially if you have someone to back you up to hold the window while removing or re-installing it!