A few of the categories only allow the admin to post new threads. You can, however, make regular posts/replies on those threads. These categories are set up that way so that topics are organised in the right way and allows you to discuss them after they are started.
Categories you can not post threads on
Blog Feed
Fish Profiles
Invertebrate Profiles
Plant Profiles
Other Aquatic Life Profiles
Ecosystems and Biotopes
Articles
Categories you can both post replies and threads in
News
FAQ
User Forum
Aquatic Exploration
Fish and Other Photos
Abandon Ship!
