About the "Parrallel connection" method, how to connect the dot matrix screen to the MCU

[ShiPC123]

IN the link https://github.com/board707/DMD_STM32/wiki/Connections---Monochrome#connecting-more-than-one-panel
I found that the lattice screen can be Parrallel connection, but in the sample file, I found that the code only declares the following pins.


But part of the actual HUB75 pin is not used, how should I match the IO of the MCU with the lattice screen? Can you give me a wiring diagram?
In addition, I found definitions of SCLK and CLK in the code. Is SCLK corresponding to LAT in HUB75E and CLK in HUB75 interface?
In addition the code uint8_t pins[] = {PA5, PA7, PA6}; // In CLK, row1, row 2

Pin PA7 which Note row1 ,what pin should I connect to the first dot screen in the first row