I'm ok for my posts now, thanks. I can't find that button you are talking about directly in user CP. I have found though, in Search forums, that you can search user's posts. Is this the only way to do?
Click on "Quick Links" at the top of any page and then select "My Profile"... from your profile you can click the "Find all posts by weezyfbby" or "Find all threads started by weezyfbby." You may not be able to search if there are a lot of people on PbN at the time.