How can i get rid of the starting message in roblox chat "Chat "/help" for a list of commands?"

This seemed to work for me.

script.Parent:WaitForChild("Chat").DescendantAdded:Connect(function(c)
    if c:IsA("TextLabel") and c.Text == "Chat '/?' or '/help' for a list of chat commands." then
        c.Parent:Destroy()
    end
end)

wait(0.1)
for i,v in pairs(script.Parent:WaitForChild("Chat"):GetDescendants()) do
    if v:IsA("TextLabel") and v.Text == "Chat '/?' or '/help' for a list of chat commands." then
        v.Parent:Destroy()
    end
end

Open studio, press play, in the explorer window open "Chat", copy "ChatModules", stop testing, and finally paste the ChatModules folder back into chat. This will now allow you to modify part of Roblox's default chat functionality, including removing that message.

To remove the message, open the ChatModules folder, and open the script "ChatCommandsTeller." Now, scroll to the bottom of the script. You should see this:

if ChatSettings.GeneralChannelName then
    local allChannel = ChatService:GetChannel(ChatSettings.GeneralChannelName)
    if (allChannel) then
        allChannel.WelcomeMessage = ChatLocalization:FormatMessageToSend("GameChat_ChatCommandsTeller_AllChannelWelcomeMessage","Chat '/?' or '/help' for a list of chat commands.")
    end
end

Delete it, and the message will be removed.