In the box of the Sound Bar you will find a piece of paper which is meant to be taped to the wall and leveled out.
Then you can take something to make markings on the wall through the paper for the mounting brackets.
Then drill 4 holes that fits the plugs and screws.
Mount the two brackets and insert the four finger screws in the four holes on the rear of the Sound Bar. (the two lowest finger screws are used to adjust the distance to the wall)
Then hang the Sound bar on the wall brackets after you connected the power cables and audio cables.
Helpful hint: The supplied velcro tape is for mounting the power supply inside the rear cavity of the Sound Bar.
Example of the drilling template