First of all, I'm aware of the irony of posting a message about my inability to post! However, it seems i have no problem starting a topic...yet i am unable to reply to any existing topic. Am I being thick or is something odd going on?
Yep, you just need to activate your account. All the information about account activation can be found right here, along with a link to resend the activation email. Let us know if you have any more questions!