How do I change the body colors?

This is what I have:

while true do
	game.Players.LocalPlayer.findFirstChild("Body Colors").HeadColor.Color = Color3.new("Bright blue")
end

Is that trying to change all players head color?

Well, you would do something along the lines of this in a local script:

local player = game.Players.LocalPlayer
local char = player.Character

char.Head.BrickColor = BrickColor.new("COLOR HERE")

etc., etc.