He’s right again. The default setup should allow both of your computers online assuming they join the right network.
We can definitely help you get it working if it’s a configuration problem but the important questions are as follows:
1. What type of internet is it? Who is your carrier (ISP) ?
2. What’s the model of your router?
3. What is the error message you are getting when trying to join the network with the second computer?
4. If you can successfully join the network but not see the internet, can you ping the router from that computer?
These will give us a real good place to start. Once we know the model number we will be able to walk you through opening up the administrator console and looking at the log files so we can tell you what your actual problem is.