Cannot connect to internet! Help!

Hello! I am new to linux and i am willing to learn so that i can use it properly. I just installed Ununtu linux on my desktop. But i can't connect to internet using cable modem. My connection is working since i tested via ping tab from Network tools. And i know how to get info about  current connection from terminal. But i just don't know where else to check or alter setting to get me connect to internet. Please somebody help!

connect to internet

Turn off computer, then recycle the cable modem, pull all plugs from cable modem and pull out the battery inside the cable modem, count to 20 put battery back in, plug in all the cables to the modem, wait for all the green lights, turn computer back on, and then your done... you will have a connection....