Ah, I get it now ... cd is a basic change directory command used to navigate around from folder to folder.
I think now I understand your issue, is this possibly one of your first times at using Terminal?
Look to be perfectly honest benz animosus, I don't know a whole lot about Terminal. It's quite possible that the instructions I found for you on the internet could be incomplete ... your last post has made me realise that it's missing a vital first step for beginners, so who knows what other vital beginner steps are missing.
The last step which is run the game by executing the script etc could be a 2 part step where they only provided the 2nd step ... "run the game" might require a terminal command in itself, I couldn't tell you for a fact if this is the case because I plainly don't use Terminal that much.
As I wrote earlier it's extremely easy to totally screw up your Mac OS installation by using Terminal without a relatively good knowledge of what you are doing & a whole lot of diligence.
I strongly advise you to educate yourself on Terminal as much as you need in order to carry out what you are attempting.