Help with Hatch Back...

For some reason its leaking water on the left side of the trunk... its not much but it does leave a little puddle... and when I lift the hatch water drips from that plastic cover, anyone know how to take care of this?

I also wanted to ask if anyone could send me a couple pictures of the way the little cover of the trunk hooks up. When I bought it, it was broken at the hinges, but I can't figure out what to put on the existing poles. Is there an extension that I need to attach, because the poles don't reach the sliders. Thanks :)

Oh yea, and I don't know what this is, but whenever I hit bumps the inside lights turn on... can anyone tell me where the sensors are on the doors/hatch?