Wireless Modems

So, I happen to be running CC 1.7, and want to make a network using the wireless modems.
Whenever I type

rednet.open("top")

it just says "Program not found", what am I doing wrong?
The wiki says to just type it.

It sounds like you're just typing that as the computer starts. You need to put that in a program if you want to use it.

To elaborate on Cranium's post, when the computer starts, it only accepts programs and their arguments.

You should probably write a program. To do that, type 'edit <name>'
After you've saved and exited from that, just type the name of the program to run it.

If you want to experiment with code a line or so at a time, run the 'lua' program.

Alright, thanks.