not sure I got you right, but search button is almost at right-up corner, under your username and watches. Search itself is devided into categories such as users, systems, etc.
Here are a lot of users who connect their trading accounts and verify them, so that myfxbook takes data exactly from brokers' feed. Whether your system is private or public, you may or may not set 'show' option for the community outlook in your account settings. So this site gathers info from all connected accounts and displays trading statistics in the outlook. If I not mistaken, on forexfactory there is alike thing called trading sentiments. Average price of those set by active trading accounts connected to this service.
P.S. This all is just my vision of this as far as I sorted out how does myfxbook work. Hopefully Ethan will correct me if it is really not so.