How to Get Menus to Show Up on the Menu Bar

I was wondering if someone could tell me how to get custom menus to appear on the menu bar? I’m going through some video tutorials and most of them start off by having a drop down menu relating to the topic on the menu bar, something that my version of Unity doesn’t have set up.

Pic of what I mean:

As far as i know custom menus are added through scripting.

Many plugins or utilities have them, like the Terrain Toolkit.

As soon as you import the package and let the scripts complile, the menus should appear automatically on your menu bar.