Vessel Sink

basin?
OK, bought a unit with a pop of the drain has an overflow in it and with it, nor any statement, but escapes overflow, because there is, so that in the overflow. What I am doing wrong or what I have received the wrong flight
The pipe drain pipe has a hole in distinction to be made in the same direction as the overflow. Tailpiece If the female is not a hole (just below the hub) is not good.