How would I make these GUI visible at random times?

I have a pop up GUI in my game that I want to pop up randomly

m = math.Random (1,2)

m == 1 then
wait(m)
script.Parent.Visible = true

How would I go about this?

--LocalScript

local player = game.Players.LocalPlayer
local guiName = "ScreenGui"
local gui = player.PlayerGui:FindFirstChild(guiName)

local randomTime = math.random(5, 10) --the countdown will select a random number 5 - 10

while gui do
	--Countdown
	for i=randomTime,0,-1 do
		if i == 0 then
			gui.Enabled = true
			wait(3)
			gui.Enabled = false
		end
 		
		wait(1)
	end
	
	wait(0.1)
end

--If the gui is not found, then this will print... You don't have to write this
print("Gui is not found!")

change the guiName to the your gui's name