Well, I can try to explain it, bear with me here.
From the TV you take the output audio which is going to be a female RCA jack, using a RCA cable you will go to probably a TV Input on your receiver (it'll be labeled). Just match up the corresponding labels on the TV to your receiver
To hook up your sub to your receiver, If you only have one RCA jack for your sub out, get a "Y" adapter and run RCA cables to the Behringer then run speaker wire to your sub.
TV----->corresponding Inputs on the Receiver--------->RCA SUB OUT to the Behringer----->Wire up the sub and pound away
Make sure to check the manual on the behringer and set up the switches in the back so you have it set on brideged (if your running a single sub setup, which I think you are) and have the lowcut filters OFF and set the crossover over on your receiver around 60-80hz.
Off topic
I jus tlooked at my manual for my amp, and its in about 5 different lanugages, but not one of them is english.... Might be part of the reason I got it cheaper.... hmm