I'd like to post a message in one of the forums but I can't find the option to make a new post anywhere. All I see is the option to reply to other people's posts. I've searched the FAQs and can't find anything. Thanks in advance for your help! Cheers.

Look at the bottom left above "bookmarks", you should see the "post reply" option. Another way to do this is to scroll right down to the bottom until you see a white box, then click on "go advanced" underneath it.