Where is the Spam button.
Also sometimes when I post something I can't find it either. I then go to "My profile" to find the listing and I find out where it actually posted. I always thought new postings went to "unread topics" but apparently they don't, at least not for me.
For instance, I have 2 windows open for the message board. the first I found this listing under "Unread topics"
On the second window, I couldn't find it there so checked my topic log and recent messages, not there. Checked "main" which is the catagory it was listed under and found it.