player=game.Players.LocalPlayer
script.Parent.MouseButton1Down:connect(function()
if player.Character:findFirstChild("Head") then
player.Character.Head.BrickColor = "Pastel brown"
else
local h = Instance.new("Head", player.Character)
h.Head.BrickColor ="Pastel brown"
end
end)
This is what I put into a local script in a gui.

1 comment
Thanks. I found a mistake you made in line 7 you did not define plr so I used player.