If I recall, you’d need to connect the line in on the Sonos Move to the headphone output on the MacBook Air, or use the AirPlay output from the Mac. Note that in order to be in true stereo, these Moves will need to be connected to your router via WiFi, or Ethernet cable. You may be able to send the Mac’s signal via Bluetooth, as well.

Since the Sonos isn’t really designed for use as a computer speaker, there may be some delay on any or all of these connection methods. You would likely be much better off going with non-Sonos speakers, instead.

You may want to read the posts in this group, too:

 https://en.community.sonos.com/groups/sonos-products-as-pc-speakers-229137