Hi, I bought the airport express so that i can "extend" my current wireless network which is situated on the 2nd floor. And i need a stronger signal on the 3rd floor. But how do i know that my macbook pro is connected to my airport express instead of the 2nd floor router? PS: I can only choose to join current wireless network, as when i tried to choose extend wireless network, it said that it could not be extended. Sorry for such a noob question as im a 2 week old mac user! Thank you.