You can personalize all your email by creating an email signature, and it will add to your outgoing email automatically. If you don’t know how to change signature in Yahoo email, then keep reading. Tap on the settings menu icon and select more. Now, select writing email and then tap the toggle button. It will help to enable or disable a signature for the email address. Lastly, you can either enter or edit the signature in the text box. By following these steps, you can smoothly change the signature in Yahoo Mail.