Depends on what you mean by “this”. What, the forum itself? That should be pretty self-explanatory. IIRC you can read without being signed in, but to post, you need to register. Should be a link at least on some frontpage, or it's probably reachable from the “Log in” link on every forum page.

Or did you mean getting the source? I'm not sure. Could well be the links on the frontpage are wildly out of date; don't those SourceForge pages talk about Python or something? AFAICR, it's been written in Java for a couple of decades now... As I said, get in touch with Scott.

But of course it makes most sense to try it out first, to see if it's what you want.