How to make a system message In Chat?

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local FD = ReplicatedStorage.FD

FD.OnClientEvent:Connect(function()
	local brickColor = BrickColor.new("Lime green")
	game.StarterGui:SetCore("ChatMakeSystemMessage", {
		Text = Game.StarterGui.FD.Frame.Input
		Font = Enum.Font.FredokaOne;
		Color = brickColor.Color;
		FontSize = Enum.FontSize.Size96;
	})
end)

I am trying to make it so when i put something into the textbox and i click the button then it sends a system message in chat.

The script is stored as a local script in startergui.

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