How do I enable Apple Music on my Mac?

I'm paying for it so I'd like to be able to use it. It used to work. There used to be an option under Preferences in iTunes to switch it on. How do I switch it on now that iTunes has been replaced with Music? The only stuff I can see in Music is music imported from CDs or elsewhere. It's working on my phone.

(I seem to spend more time trying to get music to work than actually listening to it. Does anyone else feel this way? The Music app is dismal. This is just one problem out of too many to list in one post.)