Any guides for using filteringenabled?

I have been looking through the wiki and it doesn't really explain how to code with it. I read that they need to be coded differently so they fire on the server when they are in a local script in the player... Or something like that.

Here is local script inside the player that breaks.. I have no idea how I would change it to make it work...

wait(1)
repeat wait() until game.Players.LocalPlayer
wait(1)
local player = game.Players.LocalPlayer
print("Found Player")
local character = player.Character
print("Found character")
local Hlth = player.Character.Humanoid.Health
print("Found health")
local MaxHealth = player.Character.Humanoid.MaxHealth
print("Found MaxHealth")

local bg = Instance.new("BillboardGui")
bg.Parent = player.Character.Head
bg.Adornee = player.Character.Head
bg.Size = UDim2.new(1, 0, 1, 0)
bg.StudsOffset = Vector3.new(0, 3, 0)
print("MadeGui") 

local frame = Instance.new("Frame")
frame.Parent = bg
frame.Size = UDim2.new(1, 0, 1, 10)
frame.BackgroundTransparency = 1
frame.BackgroundColor3 = Color3.new(1, 1, 1)
print("Made Frame")

local text = Instance.new("TextLabel")
text.Parent = frame
text.Position = UDim2.new(0, -65, 0, 0)
text.Size = UDim2.new(0, 150, 0, 20)
text.BackgroundTransparency = 1
text.BorderSizePixel = 0
text.TextScaled = true
text.TextWrapped = true
text.Text = Hlth.."/"..MaxHealth
print("Made Text")

player.Character.Humanoid.HealthChanged:connect(function(HTH)
    text.Text = math.floor(HTH).."/"..MaxHealth
end)