Arduino Yun kit iOS app

I recently installed a Yun shield on my Uno. I installed the jumper to disable the serial USB port, and I am able to load sketches just fine via WIFI. So, what I am trying to do is get it to work with the Arduino Yun kit app, that has a sketch ready to upload and is supposed to let you control anything.
When I input the IP address of the Yun shield, into the browser on my PC, I link right up to it. But when I input the same IP address into the app, it doesn’t recognize it. Of course I have played around with this and entered multiple IP addresses and different combinations of Yun and Uno board selections.
Had anyone else had trouble with this Arduino Yun kit app?