Q: settings not available to cancel apple music

Not sure which settings you are going to, but you need to go to select one of the methods outlined in this Support Article to cancel the subscription:

View, change, or cancel your subscriptions - Apple Support

Cheers,

GB

That is strange. Have you tried logging out of your Apple ID in iTunes, quitting iTunes, restarting iTunes and then logging back into your Apple ID and see if the subscription item is there?

I would suggest you contact iTunes Support at this point:

iTunes Support WorldWide

Cheers,

GB