When you add LEDs you specify the RGB order of the LED colors. Change this variable until you find the one that matches your particular string (probably GRB).
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I normally use the Aidafruit libraries. They have good support.
e.g.
// ------------------ NeoPixels -----------------
#include <Adafruit_NeoPixel.h>
#define LED_PIN 4
#define LED_COUNT 120
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);
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Here’s a link to the Adafruit GitHub repo for the NeoPixel libraries if anyone is looking for it. Usage and installation instructions are at the bottom of the page in the README:
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