Unfortunately, due to the sheer number of spam bots registering on the site in order to post utter CRAP in the forums, I've had to restrict posting within the forums. Any registered users can still post comments, but starting new threads is being restricted to those who have signed up for a shell account.
Whilst it might be nice to implement something like Akismet, to date I've received exactly zero donations to support the site, so this equates to approximately zero justification for spending yet more of my own money on something that's unlikely to break even any time soon.
If you have any problems posting comments or otherwise, then mosey on down to #yunix on irc.freenode.net and tell someone about it. There's not a whole lot of activity in channel currently, but ask away and stick around for a response. It's as easy as that.