Ok so Tv is on input 1 and radio is input 2. Feeling in the back of the tv, locate the cable wire. There are two rows of standard RCA jacks. The row towards the outside of tv (towards cabinet door) has 6 jacks. White wire from sound bar plugs in last jack farthest from cable input and red plugs into next one.
On TV setup under sound turn off TV speakers.
Make sure sound bar is on the right input. You need to press input button twice to change inputs...