https://support.apple.com/en-us/109511
Make sure you’re signed out of iCloud
Signing out seems to be the issue.. I haven’t used it in years, and I don’t have the password written down, so know I have to change the password but I don’t remember it. And I don’t have it written down anywhere. I am connected to the Cloud, so if I change it with my phone or iPad, it should change for all three, right?