Where to install tension clips?

You can make a full screen for your wood exterior window. I recommend using a 3/8" thick screen frame and make it just slightly less than the opening to compensate for the window being out of square. I also recommend a horizontal center bar to give it rigidly. 

Use two 70-004 pull rings on the bottom of the screen. On the exterior frame at the top corners, install 70-056 hangers, so you have something to slide the screen into. 

After all that, you would be able to swing the screen in and, with the sill screws installed, flip the pull rings over to lock the screen.

I have some advice to add to my brother's response. You want to nail the 70-056 inside the two top corners of the window frame. Have them rest up against the blind stop of the window frame where the screen will rest. Then you will need to install two of the pull rings at the bottom of the screen. Using either the 70-004 or the 70-204, slip the top of the screen into the 70-056 hangers and push the screen up against the window stop. Rest the pull rings down on to the wood window sill and mark the locations of the ball head screws which the pull ring will latch onto.

The 70-056 hangers are placed at the top of the window cores in front of the blind stops so that the screen rests against the blind stop. I recommend two bottom pull rings to secure the screens against the wind.