CGA color palette

[iokaravas]

Hey everyone, I love FabGL , I recently got a TTGO and I've been trying around some old games on PC Emulator.
I'm trying to change the default colors in CGA from green, red and brown to cyan, magenta and white.

I noticed this line in code:
#define CGA_COLORCONTROLREG_PALETTESEL 0x20 // 0 is Green, red and brown, 1 is Cyan, magenta and white
but I'm not sure how to set the value to 0 or 1.

Thank you in advance!