WeatherTech Window Deflectors

I'm having trouble installing the rear side window deflector. I have 2 manual. One said peel of the sticky and install it. The other one said, use the retention clip to install with the window deflector. I called customer service and it didn't really help.

My main problem is with the retention clip, I know that it is made to told the window deflector but the way the instruction show seem impossible. If anybody have pictures of step by step, that would help.

Right now, I took one of the stickers off the deflector and close the window, I don't know if that's gonna help but i'm so fed up that I had to do something.