Follow the steps to reset your forgotten Yahoo password using the email address of your choice or answering your security questions.
This method is most commonly used for people who have forgotten their Yahoo password and it is very easy. The only condition is that you should have a valid email address, alternative, or answer to your security question. If you don't have any of them, you will need to swich the second way.
Restore your forgotten Yahoo password.
First get Yahoo password restore tool here: Wondershare WinSuite 2012 an amazing program that can help in getting Yahoo password back in 3 steps.