Adding new songs to existing playlist?
I have the 1.1.3.3 version of Apple Music. I haven't added music in over one year. Now I seem to be unable to do that. Is there any one to buy just one song and add it to a playlist? Or is this no longer possible. If necessary to have some sort of subscription, how do I do this, or figure out if I already have a subscription? Thanks.
iMac 21.5″, macOS 10.13