To reveal the control button, first, carefully remove the front cover of the Sound Bar.

Use the plastic iFixit opening tool to lift up the front surface. Insert the tool between the cover and the body to open it.

After the cover is fully removed, it will be able to see the interior speaker.

Carefully unscrew all 16 screws to release the panel.

There are total 16 screws that secures the panel onto the cover. Each screw is approximately 1.50 centimeter.