[PROBLEM] How does the Clock Radio work?

[Wheel_nut]

How do I "Use 'Set for clock radio' on the Playlist item menu to populate this read-only field." in the M/Configure/ Clock Radio panel?

I realise that I am being a bit thick here but I can't find a "Set for clock radio" option in the dropdown of the Radio station in the playlist.

I am running moOde 7.4.0 on a RPi 3B. Thanks for the update made available today Tim.