Hello Kate_technicallychallenged,
Welcome to Apple Support Communities. It sounds like you're having trouble with audio for a video you recorded using Photo Booth on your Mac. We are happy to share information that may help.
First, check your settings. Navigate to menu > System Preferences > Input. If you were using the internal microphone on your Mac to record audio, be sure that you see that listed.
If you're unable to hear any audio from your Mac speakers, take a look at the steps here: If the internal speakers on your Mac aren't working.
Another step to take to isolate the issue is to record a new video, and play it back. Were you able to hear audio in that video?
Also, check to see if you have any Bluetooth devices paired with your Mac. If you do, unpair them, and try again to play the video.
Finally, if you're still having trouble with this, please reply and let us know if you're only experiencing audio issues with this video, or if you are unable to hear any audio from your Mac.
Take care.