How do you register your P3 Pro, can't get motors to start.

To prompt activating, try pulling the cable from the tablet and reconnecting.

I have tried that, the FAQ says to turn on controller, drone, then tablet and sign in to the DJI app, then follow instructions, there are no instructions just links to my pics and videos...it did come up when I first connected and I did the registration but I had the same problem with my first P3 Pro and had to re register with the help of tech. support.