http://wiki.amplify.pt/index.php?title=Unity_Products:Amplify_Texture_2/Manual
The Amplify Texture Manager should be somewhere directly on the scene as an empty GameObject while the Amplify Texture Camera should be on your Main Camera! (That is, if you followed the official manual correctly!)
(For our project, [VRTK]/SKDSetups/SteamVR/[CameraRig]/Camera (head)/Camera (eye)
)
Now you should be good to go! Amplify has a forum, so if you have further questions, there should be the best place to ask! http://amplify.pt/forum/index.php?sid=e39b4306c1e4efb593fcaa10838170c2