For Rogers Yahoo! users, your username and your @rogers.com email address are the same pieces of information. While using Rogers Internet service, you'll encounter both terms - but they both refer to the same thing: your @rogers.com email address.
When you visit the Rogers Yahoo! home page, you're asked to sign in with your email address. Simply enter your @rogers.com email address (and the same password you use for email) into the Email field and you'll be signed in!