Sign into your Yahoo! email account.
Click on your Yahoo! name at the top of the webpage to
access drop-down options.
Select the "Profile" option.
Your account page will open.
Place your cursor over "Account Info" in the toolbar.
Options will again drop down.
Click "Change Password."
Type in your current Yahoo! email password in the first text
box.
Enter your new Yahoo! password in the lower two text boxes.
Click "Save."
Your Yahoo! password is now changed.
or
Contact Yahoo by email.
For this, you will be required to log in.
Yahoo Help
http://help.yahoo.com/l/us/yahoo/helpcentral/
Yahoo company adress
http://pressroom.yahoo.net/pr/ycorp/company-address.aspx
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