You would want to run speaker wire from the amplifier/receiver L and R terminals to the corresponding two L and R terminals on the subwoofer labelled INPUTS.
Then connect separate speaker wire from the left and right terminals labelled OUTPUTS on the subwoofer to the binding posts on your corresponding left and right speakers.
The problem I see is the INPUT AND OUTPUT terminals are not labelled on the subwoofer. If I had to guess the bottom two are the INPUTS and the top two are the OUTPUTS...this is just a guess...it could be the other way around.
PS. Also remember maintaining consistent polarity with all this wiring is critical.
