Uncomment #define DEBUG in the RN2483 library
You can find all libraries on your pc in Documents->Arduino->libraries
->Sodaq_RN2483->scr->Sodaq_RN2483.cpp is the file you want to edit.
And in the Arduino code uncomment
// LoRaBee.setDiag(debugSerial); // optional
This way all debug information from the rn module is showed.