I don't want e-mail firstname.lastname@example.org I want my email@example.com?
Hi Sandra, I suspect you may have accidentally clicked Sign UP instead of Sign IN.
"Sign Up" indicates you wish to create a new account. "Sign In" indicates you wish to log in with your existing account.
Please Sign OUT of Yahoo and go here: https://login.yahoo.com Enter your email: firstname.lastname@example.org and the password for that account.
To learn more about how to sign in or out please read this Yahoo Help article:
Sign in or out of Yahoo