The only thing you could do is delete your post and post again. You can't edit your question or answer your own question. So just delete it and post again. Hope this helps.

Probably be easiest to select an answer fir the initial question and then repost again, if needed. They probably don't want people answering their own questions and choosing their answer... as that kind of cheats the people actually taking time to answer (for nothing other than being nice and getting points for prize drawings)