Why won't MouseButton1Click work on my TextButton?

I want to make a Title Screen with ScreenGuis, but the "Play" button isn't working. This is the code that I have been trying to tinker with:

wait(0.25)
local Screen = script:WaitForChild('TitleScreenGui') -- ScreenGui
local screen = Screen:Clone() -- ScreenGui that will be put into the PlayerGui

game.Players.playerAdded:connect(function(player)
    local startergui = player:WaitForChild('PlayerGui') -- PlayerGui
    screen.Parent = startergui -- ScreenGui put into PlayerGui
    screen.Enabled = true
end)

screen.Child.Child.Child.MouseButton1Click():connect(function(player)
    -- screen.Child.Child.Child is the "Play" button
    screen.Enabled = false
end)

I searched and read about TextButton and MouseButton1Click many times but I still can't figure it out.