How do I run the installed command line tools?

[Hwang Seung Won]

I am a novice who now deals with nrf52 dk.

I installed command line tools according to the guide in the link above. I have installed several jlink programs, of which I do not know what program to run to type 'nrfjprog --help'.

I am a beginner, so I just want a simple, clear answer, rather than a difficult description or link.

[Kenneth]

https://www.digitalcitizen.life/7-ways-launch-command-prompt-windows-7-windows-8 

[Hwang Seung Won]

https://devzone.nordicsemi.com/tutorials/b/getting-started/posts/getting-started-with-the-nrf5-development-kit

I'm following the above guide.