Connect the RS301 and the device you want to connect with Airplay to the same AP (wireless network) and run iTunes on your MAC PC. Click the iTunes Remote icon on the RS301 and a list of available connections will appear. When you click the list and try to connect, the RS301 password appears. In iTunes on the MAC PC to be connected, click the icon under Volume Control to display the password window. Enter your password to connect and control RS301 and iTunes.
How can I connect iTunes Remote in RS301