Sorry for the confusion, there still are not any opened challenges or jobs. We are negotiation with some companies to open some these days.

Challenge is a en entity to which you attach your idea, by tagging it with the tag that challenge defined.

I am not trying to complain, just trying to help.

Yes, that's how it got understood. =) Thanks for the feedback, I think it needs a lot of revisions so that it's all a bit clearer.