Cannot transfer sound from PC to Bluetooth remore speaker [on hold]

I have an ASUS PC and have a BT13 remote Bluetooth-enabled speaker.

When looking at my Bluetooth devices the BT13 icon is up with the word "connected" below it. When I turn my PC Bluetooth off and then on again I can hear it connecting with the remote Bluetooth speaker but the sound of music through my iTunes app does not transfer to the BT13 speaker. The BT13 remote speaker is fully charged.

ANY HELP PLEASE?