Cannot reset iTunes password on Mac mini running Mojave

I need help resetting my iTunes password. All the online info is different than I used in the past and doesn't even look like my desktop. From my web browser, I used to just login to my apple account and change password. Now it tells me to do it from my computer system preferences and the screen shot they show looks nothing like my preferences. Every link I tried online to reset ends in a dead end, 301 (with no forwarding url) or 404 pages. I'm running my MacMini on Mjoave 10.14. Any ideas please?