This article explains how to manage your group memberships from your "My Groups" page.

To manage your group memberships/subscriptions:

1. Sign in and go to My Groups.
2. Click on Edit My Groups located above the list of groups.
3. Use the pull-down menus to choose the email address and membership type you prefer for each group, and click Save Changes.
4. If you don’t see the email address you would like to use, you can use My Email Preferences wizard to link new email addresses to your Yahoo! ID.

NOTE: You can link up to five email addresses to your Yahoo! ID.