Yahoo email account users can easily express themselves with a quote or via adding contact detail to the outgoing mail. The users of Yahoo email account can use a signature to give the personal touch to your email. The signature can be in the form of the name, symbol, contact information, business details, and much more. You can implement the below-mentioned steps for using HTML in Yahoo Mail Signature: At the initial stage, you need to position your computer system mouse cursor over or hit the gear icon. After that you need to choose Settings in Yahoo mail. Then you need to go to the Writing email category. After that make certain that Show a rich text signature is chosen under Signature. Next, you need to design the signature as per your liking by means of the formatting toolbar. Simply limit the signature to a few lines. Finally, hit Save.