It's not working in this release, as we announced
here:
This is a testing release, and it’s limited to a basic setup: it only features wired ethernet connection, it only plays music from Network Attached Storage and only outputs to USB audio interfaces. So you’ll have to wait next release for a full featured system with Wi-Fi support, USB sources, webradio streaming and management, and analogic or HDMI output. We have temporarily left out all these features to focus development on system performance and sound quality.
As an essential feature, we are going to make it work right in the next release.