You might have seen that Google Analytics has changed since this video was recorded. Google Analytics no longer requires you to add the code. If anything, all you will need to do is add the Container ID.
The process for adding will also be slightly different if you are setting up Google & Youtube Sales Channels.
Not going to list our directions on this one as Google has written some decent and easy to follow directions. The entire process is also really intuitive to complete.
If you do not have never setup Google Analytics before, the first few minutes of the video is still valid information. Everything after 2:30 seconds is out dated (which is like 1 step from her point of view). You will instead see a Yellow Box that has information and a button in it. Follow those prompts and you will be set up in no time.