Go to the Yahoo! Member Directory and click My Profiles in the top right corner of the page. Select the name you want to edit by clicking the "Edit" link next to that name. This takes you to a page where you can edit your profile.

The profiles edit page shows you exactly what other users will see, except that the yellow edit bar will not be present. You will only see the edit bar if you are logged into your own account and viewing your profiles.

To learn how to create your own sound file to use in your Yahoo! profiles, please visit How do I add a voice clip?.