When I first got my mbp last year, being new to it, I apparently filled in a wrong username. Now, occasionally, it will "pop" up when I am accessing something new that requires a username / pw. I have been trying to find it so as to delete the annoyance. I have looked through keychain, but don't see it, or other usernames for web access sites. Am I looking in the right place, or is this buried somewhere else? Not a big deal, just annoying, over time. BTW - I did go into Safari - Preferences - Autofill, and the username was not there. Just mysteriously pops up now and then.