Bluetooth control using BLExAR

Trying to experiment with Bluetooth control and getting nowhere fast at the minute, hoping someone can point me in the right direction. I asked on another thread for recommendations for a Bluetooth app, but nothing was offered. I plumped for BLExAR as it looked good and although I can get it hooked up, there is no help as to coding for using individual pin control. The only thong I tried was to switch an LED on and off. but every control switch switches the LED on and off. I just need help with using the controls to control individual pins. Or have I just wasted my money on this App?

Thanks in anticipation