At the top of the forums there is a new tab called "Beta Reports".

Stardock.net forums are a little bit different from your typical quickie-BBS forums you see on most sites. The top-most forum contains all the newest info from each sub-forum.  So if you want to get into a specific forum, you can click on a particular sub-topic and discuss just that.

For making beta reports, make sure your post goes into the category:GalCiv II discussion with the topic: Beta Reports.