Woah yeah, baby. Okay, I had a few problems getting started. In fact, in my impatience, I ended up deleting and reinstalling the iOS Amazon Music app, as it was refusing to show any HD or UHD music.

It can be done using a desktop or mobile browser, the Amazon Music app for Android, iTunes on a computer, or the iPhone Settings app if you signed up via your Apple ID. Here's how to cancel your ...