This one is from my story! As you will need an example to understand clearly.
Okayy! Now you should remember that, first two lines are important while using an overlay. And the last two lines will be automatically given in the box below the preview (if you’re doing this in episode interactive), or else if you’re doing on episode app, you will get them at the bottom of the screen. To get scales and zones, you have to press the Show helpers box on the right side and press Spot directing. There you’ll get Change overlay on the bottom right. So, that’s how you can move the overlay to your desired spot and the following scales and zones will be automatically given there. If you need anything else, you can ask me!! 
You can also consider the link I sent you before for more help!