Where do I find the choice to activate 'universe'?

I am working from a tutorial for beginners using Linux. I have Kubuntu 7.04 OS with KDE. I copied the below from my terminal. Using the terminal, I was trying to extract and install a .bin file. When I clicked enter this is what came on the screen.

steven@Studio25:~$ extract
The program 'extract' is currently not installed. You can install it by typing:

Make sure you have the 'universe' component enabled
bash: extract: command not found
steven@Studio25:~$ enable universe
bash: enable: universe: not a shell builtin
steven@Studio25:~$ sudo apt-get universe
Password:
E: Invalid operation universe
steven@Studio25:~$

As you can see, it calls for something I don't have enabled. Where would the option be located? Is it a matter of clicking on a radio button or the like? Then, I take it that I enter 'sudo apt-get install extract' and the extract feature should function, is that correct?

Thank you,
Steven Vollom, fine-artist