When you logout from any terminal/device, you are automatically logged out from ALL terminals/devices. Even if you forgot to logout from some particular terminal, just logout from anywhere, and that will suffice.
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So, unless you have shared your password with anyone (which surprisingly, many users do), there is nothing to worry about.
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If...
more... you are trying to reset your password, you need to confirm the same through your valid registered email. If you have registered through a fictitious email or if your registered email is no longer working, then resetting of password cannot be done.