I've tried filtering this chat but just can't do it?

I've tried the roblox wiki and everything but still can't figure out how to filter this chat can someone help?

game.ReplicatedStorage:WaitForChild("Events")
game.ReplicatedStorage.Events:WaitForChild("AddChat")
game.ReplicatedStorage.Events:WaitForChild("FillChats")

game.StarterGui:SetCoreGuiEnabled("Chat",false)

local Player = game.Players.LocalPlayer

local Tags = {
	TheLuaDeveloper = "Dev",
}

local UIS = game:GetService("UserInputService")

local IntervalChat = 0
local Typing = false
local WaitChatting = true

function GetTags(plr)
	if Tags[plr.Name] then
		return " [" .. Tags[plr.Name] .. "] "
	else
		return " "
	end
end

function GetNum(lin)
	if lin < 45 then
		return 20
	elseif lin < 90 then
		return 40
	elseif lin < 135 then
		return 60
	end
end

function MakeChat(plr,cc,speech,tag,ccc)
	local frame = Instance.new("Frame",script.Parent.Back.Chats)
	frame.Size = UDim2.new(1,0,0,20)
	frame.BackgroundTransparency = 1
	local pn = Instance.new("TextLabel",frame)
	pn.Text = tag .. "[" .. plr.Name .. "]: "
	pn.BackgroundTransparency = 1
	pn.TextColor3 = cc
	pn.Name = "namtag"
	pn.Font = "SourceSansBold"
	pn.FontSize = "Size18"
	pn.TextStrokeTransparency = .75
	pn.TextXAlignment = "Left"
	pn.Size = UDim2.new(0,2,0,20)
	repeat
		pn.Size = pn.Size + UDim2.new(0,1,0,0)
	until pn.TextFits == true
	local sn = Instance.new("TextLabel",frame)
	sn.TextXAlignment = "Left"
	sn.Font = "SourceSansBold"
	sn.FontSize = "Size18"
	sn.Name = "speech"
	sn.TextColor3 = ccc
	sn.Text = speech
	sn.BackgroundTransparency = 1
	sn.TextStrokeTransparency = .75
	sn.TextWrapped = true
	sn.Size = UDim2.new(0,5,0,20)
	repeat
		sn.Size = sn.Size + UDim2.new(0,1,0,0)
	until sn.TextFits == true or sn.Size.X.Offset > 400 - pn.Size.X.Offset
	if sn.TextFits == true then
		sn.Position = pn.Position + UDim2.new(0,pn.Size.X.Offset,0,0)
		frame.Position = UDim2.new(0,0,1,-sn.Size.Y.Offset)
	else
		sn.TextYAlignment = "Top"
		sn.Size = UDim2.new(0,400 - pn.Size.X.Offset,0,20)
		sn.Position = pn.Position + UDim2.new(0,2,0,20)
		if sn.TextFits == false then
			if string.len(speech) < 45 then
				sn.Size = UDim2.new(0,400 - pn.Size.X.Offset,0,20)
			elseif string.len(speech) < 90 then
				sn.Size = UDim2.new(0,400 - pn.Size.X.Offset,0,40)
			else
				sn.Size = UDim2.new(0,400 - pn.Size.X.Offset,0,60)
			end
		end
		frame.Size = UDim2.new(1,0,0,sn.Size.Y.Offset + 20)
		frame.Position = UDim2.new(0,0,1,-sn.Size.Y.Offset - 20)
	end
	frame.Parent = nil
	return frame
end


UIS.InputBegan:connect(function(key)
	if key.KeyCode == Enum.KeyCode.Slash and not Typing then
		script.Parent.Back.Type:CaptureFocus()
	end
end)

script.Parent.Back.Type.Focused:connect(function()
	Typing = true
	script.Parent.Back.Type.BackgroundTransparency = 0
	script.Parent.Back.Type.TextStrokeTransparency = 1
	script.Parent.Back.Type.TextColor3 = Color3.new(0,0,0)
	while Typing do
		wait(.1)
		local num = GetNum(string.len(script.Parent.Back.Type.Text))
		if num == 20 then
			script.Parent.Back.Type:TweenSizeAndPosition(UDim2.new(0,400,0,30),UDim2.new(0,5,1,-30),"Out","Quad",.05,true)
		elseif num == 40 then
			script.Parent.Back.Type:TweenSizeAndPosition(UDim2.new(0,400,0,50),UDim2.new(0,5,1,-30),"Out","Quad",.05,true)
		else
			script.Parent.Back.Type:TweenSizeAndPosition(UDim2.new(0,400,0,70),UDim2.new(0,5,1,-30),"Out","Quad",.05,true)
		end
	end
end)                                 

script.Parent.Back.Type.FocusLost:connect(function(Entered)
	Typing = false
	script.Parent.Back.Type.BackgroundTransparency = 1
	script.Parent.Back.Type.TextStrokeTransparency = .5
	script.Parent.Back.Type.TextColor3 = Color3.new(255/255,255/255,255/255)
	if Entered and script.Parent.Back.Type.Text ~= "" then
		game.ReplicatedStorage.Events.AddChat:FireServer(Color3.new(255,255,255),GetTags(Player),script.Parent.Back.Type.Text)
		script.Parent.Back.Type.Text = "Click here or type '/' to chat"
	end
end)

game.ReplicatedStorage.Events.RepChat.OnClientEvent:connect(function(args,p)
	if not WaitChatting then
		local chat = MakeChat(p,p.TeamColor.Color,args[3],args[2],args[1])
		for i,v in pairs(script.Parent.Back.Chats:GetChildren()) do
			v:TweenPosition(UDim2.new(0,0,1,v.Position.Y.Offset - chat.Size.Y.Offset),"Out","Quad",.1,true)
			if v.Position.Y.Offset < -v.Size.Y.Offset -200 then
				v:Destroy()
			end
		end
		chat.Parent = script.Parent.Back.Chats
	end
end)

game.ReplicatedStorage.Events.FillChats.OnClientEvent:connect(function(chats)
	print("Filling")
	for i = #chats,1,-1 do
		if chats[i] then
			local chat = MakeChat(chats[i][2],chats[i][2].TeamColor.Color,chats[i][1][3],chats[i][1][2],chats[i][1][1])
			for i,v in pairs(script.Parent.Back.Chats:GetChildren()) do
				v:TweenPosition(UDim2.new(0,0,1,v.Position.Y.Offset - chat.Size.Y.Offset),"Out","Quad",1/30,true)
				if v.Position.Y.Offset < -v.Size.Y.Offset -200 then
					v:Destroy()
				end
			end
			chat.Parent = script.Parent.Back.Chats
		else
			WaitChatting = false
		end
		wait()
	end
	WaitChatting = false
end)