How do i add colors to certain ranks?

I'm not really good with lua so i'm not sure how to do it but i want to know how i can make certain ranks in my group have color. This is a free script that i took.

-- Put this script in the StarterGui.
-- Then change the GroupId to your Group's Id.

local GroupId = 1141296

repeat wait() until game.Players.LocalPlayer and game.Players.LocalPlayer.Character and game.Players.LocalPlayer.Character:findFirstChild("Head")
local plr = game.Players.LocalPlayer
local head = plr.Character.Head
if plr:IsInGroup(GroupId) then
local gui = Instance.new("BillboardGui", head)
gui.Adornee = head
gui.Size = UDim2.new(100,0,1,0)
gui.StudsOffset = Vector3.new(0,3,0)
gui.Name = "RankGui"
local rank = Instance.new("TextLabel", gui)
rank.Name = "Rank"
rank.BackgroundTransparency = 1
rank.BorderSizePixel = 0
rank.ZIndex = 2
rank.Font = "ArialBold"
rank.Text = plr:GetRoleInGroup(GroupId)
rank.Size = UDim2.new(1,0,1,0)
rank.TextColor3 = Color3.new(1,1,1)
rank.TextStrokeColor3 = Color3.new(0,0,0)
rank.TextStrokeTransparency = 0
rank.TextScaled = true
rank.TextWrapped = false
end

Good on ya for attempting to write the code for this. I understand not knowing where to look, and having everyone shouting at you for not knowing how to do it.

Anyway, you can get their rank's name using the GetRoleInGroup method of their Player, with the group ID given as an argument.

Using this, and a table of possible text colors, you can set their text color like so:

-- Put this script in the StarterGui.
-- Then change the GroupId to your Group's Id.

local GroupId = 1141296

local TextColorByRank = {
	"Member" = Color3.new(1, 1, 1),
	"Administrator" = Color3.new(1, 1, 1),
	"Owner" = Color3.new(1, 1, 1),
}

while not Game.Players.LocalPlayer do wait() end
local plr = game.Players.LocalPlayer
local head = plr:WaitForChild("Head")
if plr:IsInGroup(GroupId) then
	local gui = Instance.new("BillboardGui", head)
	gui.Adornee = head
	gui.Size = UDim2.new(100,0,1,0)
	gui.StudsOffset = Vector3.new(0,3,0)
	gui.Name = "RankGui"
	local rank = Instance.new("TextLabel", gui)
	rank.Name = "Rank"
	rank.BackgroundTransparency = 1
	rank.BorderSizePixel = 0
	rank.ZIndex = 2
	rank.Font = "ArialBold"
	rank.Text = plr:GetRoleInGroup(GroupId)
	rank.Size = UDim2.new(1,0,1,0)
	rank.TextColor3 = TextColorByRank[plr:GetRoleInGroup(GroupId)] --The line I changed.
	rank.TextStrokeColor3 = Color3.new(0,0,0)
	rank.TextStrokeTransparency = 0
	rank.TextScaled = true
	rank.TextWrapped = false
end

Do note that this code will break if a player in the group joins with a group name that isn't in the TextColorByRank table. You will have to add checks for that yourself.