I don't know how to change my ringtone.
Nope, sorry Carl. I'm having the same crazy difficulty trying to find where and how to change or even add ringtones. There is no "Sound & Notification" category like on most phones. There is a "Notification Drawer" category but no sound setting. I've looked in all the setting categories and found nothing. No owner's manual either which I'm looking up. Will let you know when I know.