In case anyone else might be in the same boat as I, here is the response I received: "this feature isn't available to consumer subscribers just yet... but we're working on rolling it out more widely and you should have it soon! When you do, it will be on the challenge page in the right column, and also on your profile page. You'll be able to backfill moods if you want, and that will accrue raffle tickets back to the start of the challenge on the 5th." Hope this helps! Best wishes!

Thank you! I did receive a very helpful response to this question on the challenge website - I'm all set. :)