Boxee, Airport Extreme and ethernet cable

OK....if you read my other cry for help maybe this is a solution.  Could I attach a ethernet cable to the back of the Airport to the ATV direct?  They are close in the sale entertainment center.  Would this solve my problem?  It still asks for a user name and password.....does it mean the computer (I removed password) does it mean Airport (entered that and nothing) or does it mean Boxee?