Need Help with Fortiextender

Hey Guys im writing a paper on fotigate for university. I wanted to connect a fortigate wuth fortiextender 200f to use it as a lan extension but the ordered fortiextender isnt coming in time So i have a question for you guys: Can you use the f200 to connect another subnet to the fortigate, like a side-side VPN Can you tell me in theory how to install the extender since i cant do it my self. Thx guys