Sorry for the delay Amy.
To add a soundtrack please try the following
1. Tap on the blue plus button (top left corner of the screen below the home button)
2. Select Media
3. Select Audio
You should see options to add music from your local library or from the Rush Soundtracks which are included for free
Let me know if you have any additional questions.
amy herring commented
i am a beginner... how do you add a soundtrack
Sorry for the trouble. Can you please try adding a soundtrack to your project. Once the soundtrack is added, tap on the speaker icon to unmute the track. If that works, do that for each audio track.
Not sure how this happened, but hopefully this will fix the issue and allow you to record a voiceover.
Let us know how if that solves the issue.