Summarize this article in one sentence.
Mail website using your Yahoo! account. If you are trying to reset your password because you aren't able to get into your account, click here.    You will need to type it twice to confirm it.  Click here for tips on creating a strong yet easy-to-remember password. Your Yahoo! Mail password is the same password for all other Yahoo! products, including Yahoo! Messenger and Yahoo! Finance. If you're using Outlook or another email program to manage your Yahoo! account, you'll need to change the password in your account settings in Outlook. Click here for instructions.

Summary:
Log into the Yahoo! Hover over the Gear button and select "Account Info". Click the "Account security" tab on the left. Click "Change password". Enter your new password. Click "Continue" to save your new password. Adjust your mail client settings (if necessary).