Hi Deb! I've joined the same challenge, and was a little bit stumped too. From what I can see, if you click on your team you'll see a list of members. Find yourself and click on the arrow to the right - this brings up a page where you can record weigh-ins and journal entries, so I think we record our progress there and maybe also comment in the forums.
I'm a complete newbie to this site, so I hope that's right!
Good luck with the challenge!
Nothing great was ever achieved without enthusiasm. ~Ralph Waldo Emerson~