Do you know how I can turn on the 'beep sound' when a coder sends me a message in the freelance chat?

[samusmus1]

Do you know how I can turn on the 'beep sound', so that I can hear when someone sends me a message in the freelance chat? (like when someone sends a message on Skype, you hear a ring sound, how can I turn it on in the freelance page of mql5.com?)