Pairing Mp3 Player to Wireless Earplug

I am trying to help my friend connect her mp3 player (A5 Plus Digital Player) to her wireless earplug.(PlantronicExplorer Bluetooth Headset 50)...
It paired OK...(sort of) She can hear audio telling her if the mp3 player is turned on or off....but she cannot hear her music.
Can somebody help (in extremely "non-techy"language please?

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