How to add Configuration of Google Analytics / Firebase in MVC Application

I am quite new to Google Analytics/Firebase. I am trying to configure Google Analytics/Firebase to my MVC Application. I have used Firebase Analytics Official Docs but I stuck at step 1. So what have I done so far is I have created Firebase Project and enabled Analytics in it , Docs provide implementation through npm for other type of projects they have just provided a script Now I don't know where should I add that script in my MVC application so it could be used for all project.