If you are running for the first time, no connection alarm will show up in a while. Choose "Change IP" and enter your player device ip in format IP:Port. By default the port for Volumio is 22.
If there is no connection, first try to establish a connection to your player device by typing "volumio.local" in your browser. Connect your NAS to your player in browser application first.
Audioward can play .cue files and display lyrics.
This is free application so take this into consideration before writing negative feedback.