EDIT: recent changes to MATLAB Answers allow the original question poster to un-accept an answer.
- It is possible for the author of that answer to delete the answer, in which case there will be no longer be any accepted answer (leaving you free to accept another one). So if you think it is important you can try to convince them to delete their answer.
- It is also possible for forum members with enough privileges to delete answers or un-accept them, but unless the answer is totally wrong and misleading it is unlikely that that will occur. However if you think that that answer fits into this category then flag it with an appropriate explanation.
- You can write a very polite email to TMW, asking them to un-accept the answer.
Note that your original question is ambiguous: I answered the question "How can one un-accept an Answer?", not the other interpretation of "How can one edit an Answer?"
PS: Most volunteers here try to answer your question: if you later change your mind about what the question actually is, then this would not be considered a fair reason for un-accepting an answer: an Answer that correctly resolves your original question is still correct. If you realize that you actually need to solve your problem in another way, then this does not change the correctness of the answer that they gave based on your original information. In plain English: it is not fair to move the goalposts. Ask it as a new question, or add a comment.
