How to get audio from my pc to tv with an audio cable?

I went to walmart the guy told me to buy this cable it has a iphone like singe plugin on one end and the cables like you would see to plug in an xbox without an hdmi on other end i can't seem to get it to workive been trying forever i built my pc withsome help from scratch and i forgot an hdmi port help please

Added (1). The cable is a belkin the 2 sided side has an orange and white plugins the cable is in the shape of a Y

Almost all computers have a 3.5mm audio jack (for headphones), so what I suggest is getting a 3.5mm stereo audio cable to connect to your TV. Most newer model HDTV's have an audio jack as well.

Here's a pic of the required cable:
https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTrKtXzxI8a1XRzxxJvgnlbV0vAxvsz87OQhOQX2r4Z3Oe4w_0e

I could help you if I knew the exact cable you purchased. A model # would help but without that I can't really narrow down the cables. All I could give is a suggestion.