I answered a question and by mistake while editing the answer it became community wiki. Now I want to undo the action but there is no such option even if by rolling back it. Cannot it be changed ever? Nobody has edited it yet exept me. So I want to undo. Can I do it by any way? Thank you.
Undoing a community wiki is a moderator-only thing. If you accidentally made a post community wiki, you can raise a flag on that post. Unless we see a reason why that post ought to be CW, we will undo it.
In this case, though, don't raise a flag, just drop a link to the post here.