Setting up Yahoo account key takes few steps and you just need to go through the below-mentioned guidelines:
• In the beginning, you need to go to the Yahoo Account security page.
• After that hit or tap See how it works.
• Then you need to choose your device and app to get notified.
• And you have to tap on Send me a notification.
• Now, on your mobile device, just tap the Approve icon.
• Lastly, tap Always use Yahoo Account Key option.