Your Yahoo email uses the same Yahoo account information that is used for all Yahoo services. If you change the password, you will have to enter the new password for all the Yahoo services you use, such as Yahoo Messenger, Yahoo fantasy sports and Yahoo games. To protect your account, you should change your password about every three months. Changing your email password is easy and can be done from the Account Info section.
Launch your Web browser and log in to your Yahoo account.
Click the "down arrow" next to your name at the top of the page and choose "Account Info."
Enter your username and current password and select "Sign In."
Click on "Change your Password" under the Sign-In and Security section.
Enter your current password and your new password in the appropriate fields and click "Save."
Choose a password that has numbers and letters for more security.