On this first picture, try to align the circle and square.
If you having trouble, try watching this video, it really helped me get the hang of it:
In case your still having trouble, heres a gif for you:
AAAAaaaand some more pictures-
Let me know if you want to see more, there is also video like this out there, lots of it on youtube.
Be sure to check out these 3D T.V.s and others offers. Wish life was in 3D...