Portable Ubunutu

I am a Linux Newbie and wanted to try Ubuntu out.  I installed a Ubunutu on a thumb drive and now want to connect to the internet.  I am confused since there is no modum or wireded connection since it is running off a thumb drive.  My computer allready has a network and requires no dialing or pasword.  What are the steps to get connected in my case?  Thanks.