How to use the hexagrams of Fang Jing 16?

Haha, you are reading heather's book. For example, I don't know whether to change my mind or to change my mind 16. Also, the 16 hexagram in the Gankan earthquake in Yang Si Palace can be changed into 64 hexagrams, and the 16 hexagram in Yin Si Palace can also be changed into 64 hexagrams, which means that a Thai hexagram has a corresponding one in Yang Si Palace and Yin Si Palace. Which one does it correspond to or is this system not used like this? This is a big problem. Tell me when you know it.