There are several reasons why you might be getting an "Invalid Password" error message:

• Set your CAPS LOCK key correctly. Passwords are case sensitive (meaning that "PASSWORD," "PaSsWoRd," and "password" are not equivalent), so be sure to keep this in mind when entering your password.
• Wait up to 24 hours. If you recently requested a new password or changed your password, this will allow your account to update.
• Sign in with the correct Yahoo! ID. Make sure that you are using the correct Yahoo! ID when signing in to your account. If you have forgotten your Yahoo! ID, you can search for your ID online.
• Clear your browser's cache. At times it's necessary to clear your browser's cache. The cache is the memory your browser uses to store content of the web pages that you visit. Storing that content lets your browser load those same pages more quickly the next time you visit them.

If you're still having problems, please request a new password. After you receive your new password, you can change it.

For more information regarding Yahoo! IDs and passwords, please read this help section.