How?

There should be a network cable connected to your computer. Find it.
If the network cable goes directly into the NTB then it is, most likely, a crossover cable. Go back to the previous page and select the "Crossover" option.
If the network cable goes into the wall or a small box with lots of flashing lights called a router then your computer is, most likely, connected to the NTB via the network. Go back to the previous page and select the "Network / Internet" option.