Go to http://groups.yahoo.com (or you could also go to a page for any of your groups)
Click on My Account (small link near top of page, left of center)
You will probably have to sign on next, or at least give your password.
On the next page, over on the right there’s a link that says “Edit/Create Profiles”. Click on that.

The next page says Public Profiles for …(and then your name)
Just under that it says Yahoo! ID: and a little to the right there’s a small link that says “edit”

Click on “edit”
On the next page click “Edit Profile Information”
and make whatever change you want and be sure to click the “Save Changes” button at the very bottom of the window (you will have to scroll down).

Hope that helps
Kitty