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how do I change auto sign-in information

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when I sign up on websites my old email shows up in the user name box. how do I change that option?

when I sign up on websites my old email shows up in the user name box. how do I change that option?

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select the unwanted item (you can use the down arrow) in the drop-down and use the "Del" key. Type in your new email if it doesn't show as a choice when you double-click in the form field.