Hi Expert! I change my Yahoo password and it success.. when I try it on Yahoo Messenger and my password is now invalid. Please teach me how to recover my Yahoo Password.. I try to click the 'Forgot Password' but too bad, I forgot what is my birthday year when I register.. I remember I just put the fake year for me to register Yahoo quickly because I don't want Yahoo will promt me to the kid's page.. My real birthday year is 1993 but Yahoo only accept 13 year old and up. So that's my problem now.

Can you access Yahoo online, via web mail etc, if so use this password for you Y! Connection.

If NONE of your password work and you can't remember the security questions answers then you are basically out of luck.
You could mail Yahoo and explain what has happened, but I don't rate your chance of success much above dire.

See if this page will help you:

http://edit.yahoo.com/config/eval_forgot_pw?new=1&.done=http://edit.yahoo.com/config/mail?.intl=us&.src=ym&partner=&.partner=&.intl=us&pkg=&stepid=&.last=

It includes an option for "Lost ID"