How do you get it to where you can click text buttons in Surface GUis?

LOCAL SCRIPT

The scripts that go for Screen GUi's won't work on surface GUis for me. I have look around and tried to figure out the solution to this problem but I did not find one.

function onClick()

end

script.Parent.MouseButton1Click:connect(onClick)

I have things in the function but I don't think that could help find the solution but just in case...

click = 0
GUI = script.Parent

function onClick()
    if click == 0 then
        script.Parent.EntLev.Disabled = true
        script.Parent.Parent.SinDesc.Visible = false
        script.Parent.Parent.SinFrame.Visible = true
        GUI.Position = (UDim2.new(0, 20,0.2, 0))
        click = 1
    else
        script.Parent.EntLev.Disabled = false
        script.Parent.Parent.SinFrame.Visible = false
        GUI.Position = (UDim2.new(0, 10,0.2, 0))
        click = 0
    end
end

script.Parent.MouseButton1Click:connect(onClick)

So all I need to know is how do you make something happen when you click a text button in a surface GUi.