Tutorial Confusing from the Beginning

I just downloaded and installed Docker for Desktop and successfully launched it.

The tutorial says "Once you are done installing Docker, test your Docker installation by running the following:

$ docker run hello-world

Hello from Docker. This message shows that your installation appears to be working correctly. ...

Where do I do this? I try the cmd prompt and get the following message: "'$' is not recognized as an internal or external command,"

Being a bit more explicit for for a newbie would help.