I've read the Gillian Bradshaw books, aarti -- in fact I read them again within the last year or so. I liked them a lot, particularly the first and third (although the third one is about Guenevere).
After Stewart and White, I think they're my favorite take on the Arthurian legend. I didn't care for Cornwell, which I know is blasphemy around here. Still, there it is.
But it's actually quite easy to start a thread. I had no difficulty doing it the first time, and I'm the web's leading technophobe and Luddite reactionary. Just go to the top of the list of topics in the forum where you want it to go (in this case it would be either Historical Fiction or General Discussion), and just above the long reddish-colored bar, you'll find a much smaller black bar that says "New Thread." You click on that, and from there on it's just about the same as typing a reply, except that you have to type in a Title in space for it at the top of the window.