How to Create a New Yahoo! Email Address for Yahoo! Messenger
If you do not want to use your current Yahoo! Email account for Yahoo Messenger, you can create a new one to use specifically for Messenger. You do not have to feel obligated to use the email on the new account, though you will receive messages from Yahoo Messenger with information on changes and friend requests. If you already had Yahoo Messenger and want to start a new account, be sure to write down any contact names you want to keep so you can put them on the contact list of your new account.
Open the Yahoo! website in your web browser.
Click “Sign Up” at the top of the page.
Fill out the form asking for personal information and select your new Email name and password. You will also be required to enter a CAPTCHA code. This prevents Email spammers from mass creating Emails to use to send mass spam mails.
Download Yahoo! Messenger from the button on the left side of the Yahoo! homepage if you don’t already have it on your computer.
Sign into Yahoo! Messenger using your new email ID and password.