Once you receive your headset you will find it contained within a protective sleeve. Slide the headset out of the sleeve and simply unfold the unit as shown in the diagram below. You will notice a rubber band near where your phone sits, this provides grip for your phone to ensure it does not slip out.
Scan this QR Code when setting up your headset, it should work with most phones.
And enjoy your Virtual Reality Experience.
Also, a great article on how to Set the Default Viewer Profile in Unity, thanks to the guys at Talesfromtherift!