Animator Tab missing?

You will need to open the animation window. At the top of the screen click on Window, go down to animation and in the selection select animation and click, or just CTRL + 6. You will open a new window, to dock the window just click and drag the Animation Tab in the animation window to where you want it docked.

If your not to familiar with Unity I suggest you start here 👉https://cgcookie.com/course/unity-basics-introduction-for-beginners and https://cgcookie.com/course/fundamentals-of-the-unity-interface, 

All part of the https://cgcookie.com/flow/introduction-to-unity learning flow.

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