Take your sound bar out of its original packaging, and make sure you have all the cables, screws, mounts, and manuals in the package. You can use this cable to set up an analog sound connection. This port should feature two red and white connectors labeled Audio Out on your TV. Make sure the red end of your RCA cable is plugged into the red port, and the white end into the white. This should establish an analog sound connection between your TV and your soundbar. Connect your soundbar to a power outlet with the power cable, and press the Power button to turn it on. Press the Input button on the soundbar remote, and use the arrow keys to select AUX. This will open the VIZIO menu on your TV screen. This will open your soundbar's audio settings. Select the TV Speakers option with your remote, and use the arrow keys on the remote to toggle it off. This will prevent echo effect from multiple sound sources. You can switch between these two settings depending on your personal preference.  If you select Variable, the volume on your soundbar will automatically go up and down when you adjust your TV volume. If you select Fixed, your soundbar volume will be controlled by your soundbar itself.

TL;DR in Chinese:
拆开Vizio音响包装。 找到红色和白色的RCA音频电缆。 在电视背面找到“音频输出”端口。 将红色和白色电缆分别连接到电视上的端口。 将电缆的另一端连接到音响上的红色和白色“音频输入”或“AUX”接口。 确保音响是通电的。 选择“AUX”作为输入源，使用音响遥控器。 按下音响遥控器上的菜单键。 选择菜单中的音频。 关闭电视扬声器选项。 将模拟音频输出设置更改为“固定”或“可变”。