Linux. Not easy to understand first time.

Hello.
I'm completly new to LInux and i really dont understand a thing (zero, banana) but i'm enjoing it !
Instaled ubuntu , then instaled Airtime like described here : http://en.flossmanuals.net/airtime-en-2-0/easy-setup/

on browser try to open http://localhost and i get a white screen with the text " It Works. this is the default web page for this server blah blah blah " nothing more.

tryed  also to use the command on the console

sudo dpkg-reconfigure airtime 

 asks for a password but doesn´t let me input anytnhing.

Well Airtime is not showing. I guess this should be very easy...so..here i am asking.

Thank you.

sudo dpkg-reconfigure airtime