Water line connection

I purchased the water valve for ice and fresh water. All went well,but there is a water line that is not connected. It is starts from the back of the fridge and passes next to the filter housing. It is a larger tube and has an adapter on the end that seems to connect to a mechanical connection. I cannot find where it needs to connect to.
I do believe that it is somewhere in the front bottom and not in the rear due to how it passes thru a area and shielded by a flap of plastic.

Your help is appreciated. If I had a water line connection diagram it would have helped greatly.
Len