So I really want a link to the actual display you have, not an instructable that just talks about some random device. Sure, they are mostly the same, but it'd be great to confirm
But assuming the device is an SPI device, you just need to now use the driver that I've pointed out. The connections are very simple, and you just need the pins connected as per the constructor:
public Driver(bool isLandscape = false, Cpu.Pin lcdChipSelectPin = Cpu.Pin.GPIO_NONE, Cpu.Pin dataCommandPin = Cpu.Pin.GPIO_NONE, Cpu.Pin resetPin = Cpu.Pin.GPIO_NONE, Cpu.Pin backlightPin = Cpu.Pin.GPIO_NONE, uint spiClockFrequency = 20000, SPI.SPI_module spiModule = SPI.SPI_module.SPI1);
So in order, you need to select a CS pin, Command pin, Reset pin, Backlight pin, and the SPI connections, plus GND and VCC.