Reset a forgotten password
Use Sign-in Helper, Yahoo's password reset and account recovery tool, to get back in to your account.
Go to the Sign-in Helper.
Enter one of the account recovery items listed.
Click Continue.
Follow the instructions given in the Sign-in Helper.
Change your password
From a desktop or mobile web browser:
Sign in to the Yahoo Account security page.
Click Change password.
Enter a new password.
Click Continue.
From most Yahoo mobile apps:
Tap the Profile icon.
If using the Yahoo Mail app, tap Manage Accounts.
Tap Account info.
Tap Security.
Enter your security code.
Tap Change password.
Tap I would rather change my password.
Enter the new password and its confirmation and tap Continue.
If these steps don't work in your app, change your password using your mobile browser.