On your Windows computer, start by launching the Yahoo Mail application.
Tap "Manage Account" after selecting the "Settings" icon from the screen's bottom. Then select "Add Account" from the right option.
Yahoo should be selected from the list of service providers on the "Add an Account" window.
Enter your Yahoo email address, then select "Next."
Click "Sign-in" after entering your email password.
Tap "Agree," then "Done."
Go back to Windows and get into your Yahoo Mail account.