u/Intrepid-Rip-2728

Forgive my lack of knowledge.

I have the 1 line running from back panel on exterior vent opening and 2 lines running inside the fridge. Assuming im missing the rest of it.

Its frosting inside freezer and the fridge fins are icing and melting simultaneously. Assuming a replacement or extension is needed. But what am i looking at here in the pictures, enlighten me if you may.

Wanting to remove the center window pane so i can install a window ac unit in its place. Best method to go about it?