Where and how do I update my personal Profiole on this site? Searching has not helped me. I know I have a Profile somewhere that is out of date, listing a printer which I have not used for years while not including the All-in-One I purchased recently.
First you should click on your user name, at the top of the page, on the right side. So you'll be in your profile page. Then, at the right rail, look for "My Account" and click on it.
You can change your setting there.
However I'm not sure if I understood your question. I see on your latest posts page that you interacted a few years ago, in this same profile. That's not a problem. But when you say you got a printer listed somewhere, I don't know either what this could be