can I fix my sound on my air mac

Hi fixsound,

Welcome to the Apple Community.

We'd like to help ... however we don't know what it is about the sound that needs fixing.

To check the sound volume etc:

Click the Apple icon in the top menu bar > About this Mac > System Preferences > Sound

Apple support have some articles online (links below) that may help troubleshoot.

If the internal speakers on your Mac aren't working - Apple Support

If you can’t hear sound from your Mac speakers – Apple Support (AU)

If the microphone is not working in FaceTime:

If FaceTime isn't working on your Mac - Apple Support

All the best :-)