How to connect a second EX2700 extender?

First, I installed a NETGEAR Wi-Fi Extender EX2700 and connected it to my Sky Broadband router in the living room. It works fine, but the problem is I still don’t have good signal in my room, because for the extender to have good connection with the router it has to be in the hallway. Therefore I ordered another extender (the exact same one) because I thought I could connect it with the extender in the hallway and in that way I’d have good connection in my room. However I don’t know how to make this work. I would very much appreciate some help.