once you press the program button, and the Q50 recognizes the NC50, all you need to do is hit the back button, then hit finish.  the add button is still there because you may need to add more zwave devices depending on your configuration.

at this point, i would do a hard reset on the remote by sliding the switch off, then back on, and I would try resetting the nc50 by pressing the reset button on the bottom of the unit.   then try connecting them again.