To find and/or change your primary email address:

1. Sign in to Yahoo!.
2. Click Account Info located under your picture on the upper right side of the Yahoo! homepage.
3. Type your password in order to confirm your Yahoo! ID, and click Sign In .
4. Your Account Information page opens. On the "Contact Information" section, you will see a list of email addresses and which address is marked as your primary email address.
5. To change your primary address, click Update your contact information to the right of your primary email address.
6. If you have more than one address listed in the “Manage your email addresses” section, click the button next to the email address that you’d like to set as your primary email address.
7. Click Save.

Note: If you only have one email address, it is automatically used as your primary email address.