I mentioned it in my first reply to you. The Flight Manual page I linked to covers the command line utility, and most commands will give you a help screen when you type the command by itself.
It doesn’t sound like Windows.
It is, and if it was platform-specific, then I would have asked you about your OS before suggesting it.
Why does everybody on these forums not explain in specific detail how to do this stuff? Use apm install build. What does that mean?
Since in my previous post I mentioned that you use it in the command line, I have explained in specific detail how to use it. You literally just type
apm install build and the program does everything else for you (since you’re telling it which package you want, you don’t have to use the command inside a package directory). Furthermore, the Flight Manual page I linked to covers it.