I just want to buy a song from iTunes not "try it free" program

I am just trying to buy one song and I keep getting the pop up Try for Free for three months. I went to Preferences-websites-pop ups and the only thing there is apple.com so I blocked it. Did not do a thing. This is on my Mac. I also tried to do the same on my phone; no luck. Went to music and clicked off for Show Apple Music and guess what? It doesn't work! There is a very bad word that is going through my mind ion regards to Apple Music....