Depending on the option you've selected, Yahoo will send an Account Key to your phone or email. If you have access to the email address listed, click Yes, send me an Account Key. If you can receive text messages to the number listed, click Yes, text me an Account Key. From there, enter your phone number or email address, and click Continue. As detailed above, the Yahoo system determines which options to display based on certain factors. Go to the Sign-in Helper. Use the Sign-in Helper to reset your Yahoo password and regain access to your account.