The music editing method of this software is as follows:

1. Open QQ Music and click the "three horizontal bars" option in the upper right corner.

2. Click "Ringtone Production" and select "Local Songs".

3. Select the music you want to trim and click "Open".

4. Fine-tune the cropping position by dragging the crop bar or the left and right keys of the starting point and end point.

5. Click the "Preview" button on the right to listen.

6. If the cropping is suitable, click "Save".