pass word problem

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how do i get microsoft to remember a password for a website, after it
prompted me to choose"do you want microsoft to remember this password"
"yes" "no,not at this time" "never for this site"

i chose, for microsoft never to remeber the password for that site, i would
like to undo that,and have it remember the password.can this be done without
restoreing my computer to a previous date, as one i dont think that would
have fixed the problem and besides to much time has passed , if it could be
done.
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RST