Docker is not internal or external?

Question

Docker

First time with Docker.
Downloaded Docker Desktop on Windows, launched, registered.
The window says copy and paste this into the terminal docker run -d -p 80:80 docker/getting-started
. Then it says that "docker" is not an internal or external
command, executable program or batch file. I couldn't find on Google why this is a problem.
I ask for help

Answer 1

Manually specify the path to the executable files.