TEAMCOLOR script

[white saffron]

What is the "him" variable supposed to be?

And why are you using a script instead of a LocalScript in a gui

It is more recommended to use a LocalScript and if you want to send information to a script use a remote event or a remote function

[hybrid stirrup]

1. Replace the Script with a LocalScript

local player = game.Players.LocalPlayer

script.Parent.MouseButton1Click:Connect(function()
  player.TeamColor = BrickColor.new("Neon Orange")
end)

If you don't want to change the TeamColor of the person who clicked the button, then just follow step 1.