@dawngreg08,
Thank you so much for taking your time to answer the question and assist us relatively nooby noobs. I am unable to find a reference anywhere in the article to the error that both @ElenaHugo and I are having. Nowhere in the article does it address how to fix the error that pops up when I chose my new icloud.com apple id.
My Apple ID was a novelty tertiary email address when I made it up several years ago. My relationship with Apple and Apple products has changed dramatically since then and I now need my ID to be much more professional and not have my current Apple ID associated with my account. I get the error "You can only add the icloud.com address that is already on file in your account." I am going to include a screenshot.
The article really does leave out chunks of information as well as possible and probable if-then situations. If you or anyone else could provide more clarity on this specific error, that causes it, and how to fix what is prohibiting us from changing our current icloud.com Apple ID to a new, different icloud.com Apple ID.
Thank you kindly for any additional assistance you can provide!
[Image Edited by Moderator to Remove Personal Information]