How do I make this FE Compatible?

game.Players.PlayerAdded:connect(function(Player) ----- When a Player joins a server this function happens
	local Data = Instance.new("IntValue",Player) ----Makes an IntValue inside Player
	Data.Name = "Data" -----It's name is Data ([Note]: You could change it to leaderstats if you would like a leaderboard with it.)
	local XP = Instance.new("IntValue",Data) ----Makes a IntValue inside Data
	XP.Name = "XP" 
	XP.Value = 0
	local Level = Instance.new("IntValue",Data) ------- Makes an IntValue Inside Data
	Level.Name = "Level" ------- It's name is Level
	Level.Value = 1 	
	XP.Changed:connect(function() XPChange(Player,XP,Level) end) ---- To change the XP, XPChanged function occours
	
end)

function XPChange(Player,XP,Level) ------ XPChanged function
	if XP.Value >= Level.Value*150  then ----- this function occours happens if the Level's Value is greater or equal to this 150 ([Note]: Change 150 to the max XP)
		XP.Value = 0 --- Resets the XP
		Level.Value = Level.Value+ 1
	end
end

By just making it a global script. There is no reason why it should be local.