Here we take the OPPO R9S mobile phone as an example. The specific method is as follows:

1. First, click "Settings" on the mobile phone desktop.

2. Then select the "Application Management" option in the phone's settings interface.

3. Then open "Default Application Management" to enter.

4. After entering, select the "Music" option, as shown in the figure.

5. Finally, check "Kugou Music" on the music interface, as shown in the picture.