How do I program the Arduino Primo Core using the Arduino Primo? the Arduino Primo Core website (https://store.arduino.cc/usa/arduino-primo-core) says that I can program the Arduino Primo Core using an Arduino Primo.

I have no idea how to do this!

Can you do it through the Arduino IDE? Which pins on the Arduino Primo Core should I connect to which pins on the Arduino Primo?

Thanks for your help!
instructions were on arduino.org. it is turned off now, but you can find them in Web Archive (without downloads)
Arduino.org pages in web archive