How do you use an imported package in a script?

I'm trying to add in-app advertisements to my game, so I imported this unitypackage to my project. I have never imported anything into my game other than sprites, so I have no idea what I'm doing.

How do I use any of the addons that this plugin uses inside my scripts (I use C#). The scripts installed under /Assets/Scripts.

I'm sorry if I missed something really simple.

EDIT: I tried adding com.microeyes.admob; buy now I'm getting the error "The type or namespace name 'com' could not be found (are you missing a using directive or an assembly reference?)".