How to change text of a TextLabel on bilboard?

So I am trying to make a sign, with a GUI in which you can change the text. There is a textlabel in a bilboardGUI in Workspace, but the text of the text box won't change when I type something into it, therefor the text of the textlabel just goes blank. Here's the text:

script.Parent.MouseButton1Click:Connect(function()
	newText = game.Workspace.Shop.Sign.TextBil.SignText:Clone()
	newText.Parent = game.Workspace.Shop.Sign.TextBil
	newText.Name = "NewText"
	newText.Text = script.Parent.Parent.NewName.Text
	game.Workspace.Shop.Sign.TextBil.SignText:Destroy()
	script.Parent.Parent.Visible = false
end)

I'm not really that skilled but I'm pretty pre-selecting text would be something like

Part.BillboardGui.TextLabel.Text = "(da text)"

I don'y know if the equal messes up the script or what lol