How to put files in Oplayer hd with itunes

I am trying to setup oplayer hd to watch movies on my ipad. To stream them from my IMac using Oplayer hd to my ipad mini. I have found a description of how to do this at: www.blogtechnika.com/watch-any-video-on-your-iphoneipad-with-oplayer/

The description tells me to go to itunes and select the apps tap and at the bottom of the page there is "file sharing" section. Then just select oplayer hd in the list and add files from there. My problem is that I cannot find the file sharing section at the bottom of my itunes.

Any help would be greatly appreciated.

Trey