I'm only in my second week of using my iMac

I downloaded a program and have installed it. My net connection is crap so I want to turn off the signal to the net to it.

In the instructions = this is what it tells me but I don't know how to do either

" Run disable_activation_osx as root
if you dont know how to do that, open a terminal window
then issue sudo -s, a root shell will open
then simply do "sh disable_activation_osx" w/o the ""
or ./disable_activation_osx( make it executable chmod 755 disable_activation_osx
you do that from the folder where disable_activation_osx is. (just copy it anywhere on your hdd) "

I did open a terminal window and did the issue sudo -s but it kept saying cannot find file when I typed in the rest