Go into your Onkyo on screen Setup> Select Hardware> Select Network. If using WiFi and your network does not show as connected, switch WiFi OFF briefly and then back ON. If it does not connect automatically, select it from the list of available networks and enter your password.
You can also use the remote controller to move the stereo signal to another pair of speakers. Press the Quick Menu button> Select Audio> Select Stereo Assign and then select the desired speaker pair.