I was having difficulty loading the app so I called the creator personally. He lead me through the process and explained the reason why the pilot iCrew isn't available on the Spring site is due to a Flt Ops request.
The bit about "your password will be sent to you securely"? Just carry on and re-enter your network password as many times as required.
Check the background from time to time to see if it is loading. Once it starts, it should work.