If you want to change your sending name in Yahoo, please do this now:
First off, open up Yahoo Mail on your browser.
At the top-right corner of the email window, click on the blue gear icon and click "Settings".
In the Settings window, click on "Accounts" at the left, and then click on your Yahoo account listed at the right.
There, you can change your name accordingly - done that, click "Save" at the bottom-left. This should do it.
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