Posting or replying to a thread is very easy!
If you want to
Quick Reply (ie, fill in that cute little box below the post), you
need to first click on the icon that looks like:
under the message to which you want to respond. (Remember, each thread has multiple messages underneath them). The cute little box will then be turned on, and you can post.
This allows you to respond to a specific message instead of the thread in general.
Alternatively, you can simply click on
which you'll see at the bottom of the very last post on a thread.
Enjoy,
Barbara