Headphone

Hi I am trying to hook up or wire up a headphone jack in the back of my tv. my said i keep the on to loud at night. I went to Radio Shack and bought a in line 1/8 phone jack type stereo and has to be solder. I tried to hook it up but can't figure it out. i appericate if someone can help me and send a diagram on how to wire it up. This will save my marriage thank you.

sal443