How do you remove your sir name from your email? my email has my whole name and I want my name removed?

How can I change how my name appears on my outgoing email? Adjusting the "From" field changes how your name appears in other peoples' incoming mail. You can also adjust the email address they'll send a message to when they click "Reply." Here's how to do it: Click Options in the upper-right corner of your Mail page and select Mail Options. From the list on the left, click Accounts. Click Add or edit an account – it’s toward the middle of the page. In the box on the left, click Yahoo! Mail. Click Edit. In the "From name:" box, enter your name how you'd like it to appear in the "From:" line of your outgoing messages. Example: "Jane Doe", This is the name people will see in their Inboxes for messages from you. You can leave the "Reply to:" field blank, so your Yahoo! Mail address is automatically the return address when others reply to you. Or, you can specify a different return address by entering it after "Reply to:". Click Save to put your new settings into effect. Note: The "From name" field can't contain special characters like the "@" symbol. And, the address in "Reply to:" can't exceed 40 characters.

When I registered with yahoo I put my user name for my first and last name. Sign in on mail or something and go to account and try changing it that way.

you can not delete your master name on the account what you can do is to make another account with a different name it only takes a few seconds