Function Call In Another Script

//This is not the actual script used in the video, it's just a few lines that I extracted so you can copy/paste them if needed.

//Finding the game object by name, then accessing the component:
GameObject.Find("ObjectB").GetComponent<ScriptB>();

//Finding the game object by tag, then accessing the component:
GameObject.FindWithTag("ObjectBTag").GetComponent<ScriptB>();

//Finding the first game object that has this script attached to it:
GameObject.FindObjectOfType<ScriptB>();