There is simplest way to change your Yahoo Password.
Just go to Yahoo Password Change (Click the link and enter your username ID of Yahoo and password if you prompted to it)
Enter Your Current (Old) Password and Type the new one, Retype again. Push Save Button. Done
By Changing your Yahoo Password through that way, you will also change your Yahoo Messenger Password, Yahoo Mail Password, Yahoo Finance, Mobile, Yahoo Go and Else.
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