I have a question that I know should be community wiki. I don't see that option, what am I missing?
Ask it, then mark it for moderator attention. Only moderators can mark things community wiki, iirc.
Edit: See Robert's answer here
We have provided some additional guidance at the blog:
Most of the time, you should be asking yourself “How can I improve this post so that community wiki isn’t needed?” Community wiki is like a cheese knife: it is a specialized tool to be used sparingly, and only in very specific circumstances.