If you don't yourself understand what the online "paperwork" sets out, and you need someone to TELL you what to do, you would need to employ a Licensed Immigration Adviser (because NZ law forbids any private person to give immigration advice).
That said, there are many people on the forum who have gone through the process that you are just starting out on, so if you spell out what you are wondering about, they will almost certainly be able to tell you what THEY did, that worked.
So can you quote the wording that pops up about the X-ray which is confusing you? - then someone may be able to help. (Or have you looked at that link I sent to the operational manual page about the requirement for medicals? Is the question not answered there, if you read all the small print?)