[Custom Chat] How to add FilterStringAsync?

Okay, so im trying to use a Custom Chat i found.. (Ofcourse im going to edit it..) But first im trying to make it works with FilterStringAsync.. But when i try it it gives errors and stuff ;-; tried to look up a custom chat with FilterStringAsync but couldnt really find one :/

Please help me with this

local chats = script.Parent.Chats
local last

function newChat(msg,plr)
    if #msg > 0 then
        for i, c in pairs(chats:GetChildren()) do
            c.Position = c.Position - UDim2.new(0, 0, 0.1, 0)
        end
        local newMessage = script.Message:clone()
        if #chats:GetChildren() == 10 then
            chats:GetChildren()[1]:Destroy()
        end

        if plr.Name == "" then
        newMessage.TextColor3 = script.Owner.Value
        newMessage.Text = "[OWNER] " .. plr.Name ..": ".. msg

        elseif plr.Name == "" or plr.Name == "" or plr.Name == "" then
        newMessage.TextColor3 = script.Admin.Value
        newMessage.Text = "[ADMIN] " .. plr.Name ..": ".. msg

        elseif game:GetService("GamePassService"):PlayerHasPass(plr, 0)then
        newMessage.TextColor3 = script.VIP.Value
        newMessage.Text = "[VIP]" .. plr.Name ..": ".. msg

        else 
        newMessage.Text = plr.Name ..": ".. msg
        end

        newMessage.Position = UDim2.new(0, 0, 0.9, 0)
        newMessage.Parent = chats
        last = newMessage
    end
end

function join(plr)
    for i, c in pairs(chats:GetChildren()) do
            c.Position = c.Position - UDim2.new(0, 0, 0.1, 0)
        end
        local newMessage = script.Message:clone()
        if #chats:GetChildren() == 10 then
            chats:GetChildren()[1]:Destroy()
        end 
        newMessage.Text = "[CONSOLE] " .. plr.Name .. " joined the server!"
        newMessage.TextColor3 = script.CONSOLE.Value
        newMessage.Position = UDim2.new(0, 0, 0.9, 0)
        newMessage.Parent = chats
        last = newMessage
end

function left(plr)
    for i, c in pairs(chats:GetChildren()) do
            c.Position = c.Position - UDim2.new(0, 0, 0.1, 0)
        end
        local newMessage = script.Message:clone()
        if #chats:GetChildren() == 10 then
            chats:GetChildren()[1]:Destroy()
        end 
        newMessage.Text = "[CONSOLE] " .. plr.Name .. " left the server."
        newMessage.TextColor3 = script.CONSOLE.Value
        newMessage.Position = UDim2.new(0, 0, 0.9, 0)
        newMessage.Parent = chats
        last = newMessage
end

game.Players.PlayerAdded:connect(function(plr)
    join(plr)
end)

game.Players.PlayerRemoving:connect(function(plr)
    left(plr)
end)

game.Players.PlayerAdded:connect(function(plr)
    plr.Chatted:connect(function(msg)
        newChat(msg, plr)
    end)
end)

for i, player in pairs(game.Players:GetPlayers()) do
    player.Chatted:connect(function(msg)
        newChat(msg, player)
    end)
end