How do I change the user name on my Yahoo Messenger but keep my present user name on my account?

I want to change the user name on my Yahoo Messenger so that a certain person won't know that it's me. But I still want to keep my present user name on my account. Can I do that? And how do I do that?How do I change the user name on my Yahoo Messenger but keep my present user name on my account?
HOW DO I CREATE AN ALIAS

For every Yahoo! ID you can create 6 aliases.

1. In the Messenger menu at the top of Y!M choose My Account Info. You can also use this link to sign in: https://edit.yahoo.com/mc2.0/eval_profil

2. Under Account Settings click 淢anage your Yahoo! Aliases. It will take you to the page to add or delete an alias. Just click the blue Add an alias link to add an alias. Then click save on the right.

3. To delete an alias click Delete on the right.

Yahoo recently redesigned the whole Account Info page so it will look different than you are used to.



One major thing that is different in the new Yahoo Profile system is that aliases cannot have unique profiles. If you want an alias to have a profile you will have to link it to your main Yahoo ID. Only link your alias to the main Yahoo ID if you do not mind that they share a profile.



You might need to exit Yahoo! Messenger before the new alias you have created becomes available in the drop down menu of the Join a room window for chat rooms or the drop down menu under Send As in the IM box.



You can also choose to sign into Yahoo Messenger with your Alias instead of your Yahoo ID and then you will not have to change the name in the IM window or if you go to a chat room because it will already be set as your Alias.





How do I link my Alias to Primary Yahoo! ID?:

http://help.yahoo.com/l/us/yahoo/profile . If you want to remain completely anonymous then you would not want to link your alias to the Yahoo ID.