Select the gear icon, and then click on “Settings.”
Yahoo Instructions 1
Select “Writing email” from the menu. Enter your @GulfBreeze.com email address in the “Add send-only address” field, then click “Verify” to send a verification email.
Yahoo Instructions 2
Open the verification email and follow the instructions to verify the address. Note that the verification email will be sent to the forwarding address you specified when signing up for a @GulfBreeze.com address.
Yahoo Instructions 3

Congratulations, you have now successfully connected your new @GulfBreeze.com email account with your Yahoo account. You can now send and reply to emails using your new @GulfBreeze.com address.