"Missing An Assembly Reference" with gameObject

I have referenced the name of my character (Game Object) in my script, but it is saying that there is no defined type. (Are you missing an assembly reference?)

What am I doing wrong - what exactly do I type to define my Character, if for example, the object is called “Bob”.

Do I just type gameObject.Bob ? Or is there more I need

I think you want gameObject.Find(“Bob”);
this returns a game object with the name “Bob”.