Trying to change screen gui text label how do you do it?

im trying to change a text label on a screen gui in starter gui when you click a part

here is the code

local Textlabelforthingy = game.StarterGui.ScreenGui.TextLabel

script.Parent.ClickDetector.MouseClick:Connect(function()
Textlabelforthingy.Text = "the part has been clicked" end

Ok, so you don't use StarterGui, you use PlayerGui Here is the fix:

--Local Script.
local plr = game.Players.LocalPlayer
local Textlabelforthingy = plr.PlayerGui.ScreenGui.TextLabel

script.Parent.ClickDetector.MouseClick:Connect(function()
	Textlabelforthingy.Text = "the part has been clicked" 
end

It is because you are changing it in StarterGui you need to change it in the Player Gui

script.Parent.ClickDetector.MouseClick:Connect(function(player)
	local Textlabelforthingy = player.PlayerGui.ScreenGui.TextLabel
	Textlabelforthingy.Text = "the part has been clicked"
end)