Chosen Solution
How do I change the backlight of my keyboard, because what I want to do is make a custom blue colour for the backlight like a gaming laptop.
I think you’re biting off too much for a little color. You’ll need to follow this guide MacBook Air 13" Early 2015 Upper Case Replacement to Step 39. Then you’ll need to carefully unglue the black cover sheet to get the backlight unit out. Now the real fun part finding the correct LED’s that physically fit and are the same specs. Maybe a magic marker painting the LED’s will offer enough color. Consider the risks! You might want to get a junker to practice on or get a replacement uppercase to check things out. Frankly, I wouldn’t do it.