How to make message only pop up one time?

I am trying to make this message script only pop up one time. It works when the player touches the block and a message pops up. When the message is over and the player touches the block again it shows pops up again which is not what I want. Any help?

function message(m)



---------------------------------------------------------------\\


m.Text = "How do I make you pop up once?"
wait(5)




---------------------------------------------------------------//

-- Color codes:
-- (1,0,0) is Red
-- (0,1,0) is Green
-- (0,0,1) is Blue
-- (1,1,1) is White
-- And you can also mix colors. (1,0,1) is Purple for example

-- For more settings, read the green text around the section below







end
function onTouch(hit)

	if hit.Parent:FindFirstChild("Humanoid") ~= nil then

		if game.Players:FindFirstChild(hit.Parent.Name) ~= nil then
		local player = game.Players:FindFirstChild(hit.Parent.Name)

			if player:FindFirstChild("PlayerGui"):FindFirstChild("ScreenGui") == nil then
			sg = Instance.new("ScreenGui")
			sg.Parent = player:FindFirstChild("PlayerGui")
			end

		if player.PlayerGui.ScreenGui:FindFirstChild("MessageBox") == nil then

					-- In this section below, you can edit how the text box looks like
		local f = Instance.new("Frame")
		f.Name = "MessageBox"
		f.Position = UDim2.new(0.3, 0, 0.1, 0)
		f.Size = UDim2.new(0.4, 0, 0, 0)			-- If Text box needs to be bigger, simply change "0.4"
		f.Style = "RobloxRound"							-- Styles: "ChatBlue", "Chat Red", "Chat Green"
		f.Parent = player.PlayerGui:FindFirstChild("ScreenGui")

		local m = Instance.new("TextLabel")
		m.Position = UDim2.new(0.5, 0, 0.5, 500)
		m.FontSize = "Size14"							-- Font Sizes: 10, 11, 12, 14, 18, 24
		m.TextColor3 = Color3.new(1,1,1)				-- Colors: (1,0,0) = Red, (0,1,0) = Green, (0,0,1) = Blue
		m.Parent = f

		message(m)


		f:Destroy()
		end
		end
	end
end

script.Parent.Touched:connect(onTouch)

since you're connecting to an event, you can disconnect the function once you're done with RBXScriptConnection:Disconnect()

in your code, that would look something like this:

local connection -- define the variable before the function, because the function needs to be able to access it
local activated = false -- if you need to know if the part was touched for whatever reason

local function onTouch(hit)
	if whatever then
		if blahBlahBlah then
			-- stuff goes here
			activated = true
			connection:Disconnect()
		end
	end
end
connection = script.Parent.Touched:Connect(onTouch) -- when you Connect to an event, it returns an RBXScriptConnection which you can use to disconnect the function later

also, make sure you put local whenever you define a variable or function

why? it's good practice

why is it good practice? it's faster when you do that, also there's global environment blah blah blah whatever It's Not Good stuff but i'm not advanced enough to tell you why global environment is bad

Hello! I can see your issue! I'd suggest using tables to store players that have already touched the brick, like so:

function message(m)



---------------------------------------------------------------\\


m.Text = "How do I make you pop up once?"
wait(5)




---------------------------------------------------------------//

-- Color codes:
-- (1,0,0) is Red
-- (0,1,0) is Green
-- (0,0,1) is Blue
-- (1,1,1) is White
-- And you can also mix colors. (1,0,1) is Purple for example

-- For more settings, read the green text around the section below

local AlreadyTouched = {}





end
function onTouch(hit)
local AlreadyTouched = false--Automatically determines player has not touched
	for i, player in pairs(AlreadyTouched) do--Checks for player that already touched
		if hit.Parent.Name == player then
			AlreadyTouched = true--Player has already touched
		end

	end
   if AlreadyTouched == false then
 if hit.Parent:FindFirstChild("Humanoid") ~= nil then
table.insert(AlreadyTouched,hit.Parent.Name)--Adds player to table

        if game.Players:FindFirstChild(hit.Parent.Name) ~= nil then
        local player = game.Players:FindFirstChild(hit.Parent.Name)

            if player:FindFirstChild("PlayerGui"):FindFirstChild("ScreenGui") == nil then
            sg = Instance.new("ScreenGui")
            sg.Parent = player:FindFirstChild("PlayerGui")
            end

        if player.PlayerGui.ScreenGui:FindFirstChild("MessageBox") == nil then

                    -- In this section below, you can edit how the text box looks like
        local f = Instance.new("Frame")
        f.Name = "MessageBox"
        f.Position = UDim2.new(0.3, 0, 0.1, 0)
        f.Size = UDim2.new(0.4, 0, 0, 0)            -- If Text box needs to be bigger, simply change "0.4"
        f.Style = "RobloxRound"                         -- Styles: "ChatBlue", "Chat Red", "Chat Green"
        f.Parent = player.PlayerGui:FindFirstChild("ScreenGui")

        local m = Instance.new("TextLabel")
        m.Position = UDim2.new(0.5, 0, 0.5, 500)
        m.FontSize = "Size14"                           -- Font Sizes: 10, 11, 12, 14, 18, 24
        m.TextColor3 = Color3.new(1,1,1)                -- Colors: (1,0,0) = Red, (0,1,0) = Green, (0,0,1) = Blue
        m.Parent = f

        message(m)


        f:Destroy()
        end
        end
    end
end
end

script.Parent.Touched:connect(onTouch)

If you have any questions, comment below!

Best,

TheLastHabanero