How do I load and run scripts?

Good morning,
Can someone instruct me how to load and run script?
If you can provide a video for this, I would be grateful.
I downloaded some scripts to test, loaded it with "LoadScript, but it doesn’t appear when I call the command: Runscript.
If you can help me with this information, because in other cases, I’ve tried to use the available scripts and I couldn’t make it work.