XF 1.3 Turning a feature on and off with Custom User Fields

I have a feature on my site which shows the name of the song currently playing on our radio station, some people have wanted to turn this feature off as the iframe where the song information is displayed is always refreshing.

I want to set up a Custom User Field or make an option so that I can give them the option of turning the Now Playing feature on or off. (Default is on)

How do I go about doing this?

A checkbox for "Display current playing song on SatelliteGuys Radio"
Display the current playing Song on SatelliteGuys Radio - Yes or No.

Thanks! :)