Q: What if I forgot my password or Yahoo! ID?
A: You can get a new password, a Yahoo! ID reminder, or both. Visit the Sign-in Problems page and supply some basic verification information, such as your birthday and the ZIP or postal code you provided when you registered.
Make sure to provide the same information you gave during registration or when you last updated your account. Without the correct verification information, you will not be able to obtain a new password.
Link to the sign-in problems page -
https://edit.yahoo.com/forgot?login
Hope this helps if you haven't retrieved it yet
