When you create an alert, you are given the opportunity to send the alert to any email address you have specified in your Yahoo! account information. If this email information isn't correct or you would like to add a new email address, go to your My Account page and make the appropriate changes.
For certain alerts, you also have the option to add a new email address by clicking "Show Advanced Delivery Options" and then "add an email address." You will be directed to Yahoo! account information where you can add an email address.
Please note: When you have added a new email address, an email is sent to that address requesting confirmation. You cannot receive alerts in the email you added until the address has been verified. Follow the instructions within the confirmation request email to verify the email address you have added.