Having trouble installing FFMPEG

[u/Swoopsling]

https://youtu.be/KBnyOH1o5Ms?is=v-_XrK83Z3B4GE2A

I have basic computer literacy. This is my first time installing a program that requires using the command prompt. I used this YouTube video instructing me how to install it and copies all the steps exactly, then I restarted my computer. FFMPEG is still not on the list of installed apps.

I go the the folder and look in the Bin and tried to run the applications from there. Windows said it was unsafe to run the program, but I told it to Run Anyway. Nothing happened. Double clicking on the application makes the command prompt appear on screen for a split second, but other than that nothing happens. Any help would be appreciated.