You can personalize every email by creating an email signature and it will be added to your email outgoing automatically. If you're not sure how to change signature in Yahoo email, keep reading. Select the menu for settings, then select additional options. Then, choose writing email and tap on the toggle icon. This will allow or deactivate a signature for an email address. In addition, you are able to add or edit the signature within the box for text. Following these instructions, you are able to effortlessly change the signature on Yahoo Mail.