You may need to go deeper (into a sub-category) to start a new post. Or you can select an available category by using the [New Topic] button on the index
Example:
You can’t start a new topic in the Communications Center
But you should be able to start a new topic in General Discussion, which is a child category of Communications Center.
If you use the new topic button on the index (category list) you will be able to select which category to post into with the “Select a category…” drop-down.
