The Wayback Machine - http://web.archive.org/web/20160830000924/https://www.roblox.com/login/forgotPasswordOrUsername/

Forgot Password or Username

If you did not give us a real email address when you created your account, we cannot send you an email.

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    Forgot My Password
    Enter your username to reset your password.
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    Forgot My Username
    Enter your email to retrieve your username.