Our challenges section, still in beta, is still at a distance from full release. However, I'm happy to announce two quick fixes to it:
(1) If you create a challenge, it'll automatically be added to your subscribers' backroom updates
(2) We've fixed a glitch where the # of entries displayed was different than the # of entries actually submitted
Eventually we'll add the necessary bells and whistles of editing challenges you've already submitted and figuring out ways to give challenges more exposure.