It's time consuming and awkward, but you can do it by clicking and selecting the ladder box next to the New Topic icon on the left side of the main page,where it says last comment, select started by and work your way backwards, alphabeticaly, using the page number selection on the top and bottom right of the post screen. Takes a while but it will bring you to the c's. It will have a lot, maybe not all if you are a frequent poster.
Or go here, since I went to it, trying to figure how to do it:
www.healingwell.com/community/default.aspx?f=35&p=56&x=25&ord=s