With our current NX300h 71 plate, you have to open drivers door first, then the boot release button on the dash can be used to open the boot. Same for the passengers doors, they can only open their doors once drivers door has been opened (or once driver presses the global door unlock button located on drivers door) Could be the same process on the new NX?
As for adjusting settings, best thing to do I find, is sit in the car and go through all the settings.