1)When u make sell\buy topic,u must,before subject, put prefix Sell of Buy(to other user can clear know what u mean).
2)Do not make fake of topic
3)In topic write(information about think u want to sell or buy,prices and images)
4)Do not spam like(person A sell phone k550,and person B wont to exange k550 whit 6600.And the u say i wont to buy 6600.No never.Open ur owen topic about buying 6600).
And if you are from same country it will be easy to exchange...