1
Follow the steps below or watch video
Signature installation steps
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2
Open Yahoo Mail and click on "Settings" in the top right corner. Next, choose "More Settings".
3Select "Writing email" and click on the switch next to the account you’d like to add the signature to.
4You'll see a text field below the email account that you chose. Paste your signature there.
Create a new email and check out your new signature.