Currently, you cannot edit an answer once it's been posted. What I normally do if I have a typo or incorrect information is add a comment to my solution with the correct info.
The person who posted a problem also gets notified there is a new comment on the website and via email.
Hope that helps!
You don't. Apparently FixYa doesn't trust us enough not to change our answers. You can add comment explaining/expanding/amending your answer, but you can't change the original answer once it's posted.
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