Okay, the "code" has been broken on window screen removal!
There are spring clips in the tops of the screens. Use your fingers underneath the top of the screen frame, push upward, the bottom should pop out of the frame (you might have to use one hand to push up the top and the other to pull out at the bottom) and, "Voila" the screen is out! To return to the frame set the top in first, push up, and press the bottom frame in and you are done.
Simple once you have the "Rosetta Stone" for window screens!!
Pass the word and start that window spring cleaning!
Robin