N-Serve was for Naim servers. You were no doubt thinking of N-Stream, which morphed into the Naim app some years ago. That is what controls the Unitiqute, and all Naim streamers.
Also, the recently released 4.9 firmware update will be required for internet radio, so you should make sure this is done before trying to use it.
Ideally you would run a UPnP server such as Asset or Minimserver on the Mac, or on another device on the home network, to play locally stored music files.
Yes I meant N-Stream of course. It’s been a few years since I used network devices. The Q2 will be fully serviced and updated at the official lab before being used, including a new display and 4.9 firmware.