Solder the Splinky to the shield PCB
The first step is to solder the splinky to the shield, please follow the instructions here:
Solder the ribbon cables to the shield
Simply connect the 5 and 6 ribbon cables from the plate PCB to the headers on the shield. Make sure the legends align.
Connect the RGB cables
Take the cables coming out of the main plate, and solder them to the MCU holder PCB.
Make sure the Vcc, Gnd, Din legends align.
Test the RGB
Connect your keyboard to the computer, and check that all the LEDs light up. If some of them don’t, they might need resoldering.