If you entered the answer to the question, but put it as a comment, rather than clicking the “Answer” link first, it’s ok. Simply click the "Answer" link and re-enter it there.
I accidentally answered a client question in the comment section.
If you entered the answer to the question, but put it as a comment, rather than clicking the “Answer” link first, it’s ok. Simply click the "Answer" link and re-enter it there.