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We're looking for feedback on your experience with BT and some of our support products, to help make them work better for you. Take our 5-minute survey and you could win a £50 Amazon voucher. Read more here, BT Customer support products
If you log in to http://bt.yahoo.com then there should be a "My Account" link at the top of the page. Click on that. Look for the "Sub Accounts" section on the page that takes you to. Each sub-account can log in separately, and has its own email address.