Trouble with Netbook Ubuntu connecting to the Internet

[Jeffrey Needle]

Hello.  I've installed Netbook Ubuntu inside Windows (the second choice 
in the install menu on the .iso).  Installation went nicely, and 
everything was fine until I tried to connect to the internet.

I have AT&T high speed internet service, with a router that wires my 
entire apartment.  Windows finds the wireless network just fine.  But 
Ubuntu is having problems.  I can't figure out how to get connected.

I've tried with both Evolution and Firefox, but no success.  I've 
ensured that both apps were working in on-line mode.

Any help you can be will be greatly appreciated.  I'm working on an HP 
Mini netbook.