1. Click the Audio Effects button-->click the desired audio effect icon.
2. Click the Music button-->click the Add Music button, then select the background music you’d like to add or upload.
3. After selecting background music options, they will be listed under the Music tab. Click the title of the background music, then click the Play button on the mini player to play it.
4. Click the play mode icon on the mini player to set the play mode. There are three modes: Repeat (the individual track), Repeat list, No repeat.
5. Click the Low/High volume buttons to change the volume of the background music.