What type of soundbar?? I've removed mine already just to check the connections. If it's the same, those screw covers slide sideways to access the screws. They likely have a little bit of adhesive behind them to, but they will still slide.
If you only have the red/white/yellow coming up to the TV, the red/white is for audio out; the yellow is for video in (assuming you have a DVD player in your soundbar). The a regular cable connection to the back of the TV, too.
Hope it works....
2018 Palomino Puma 255RKS, being pulled by 2010 Ford F150 equipped with SuperSprings SSA28, w/PullRite Superslide 5th Wheel Hitch.
USAF--25 years and counting!