How can i make a GUI pop-up on the Touched event of a part?

I have been looking on many tutorials online since i'm kinda new to Lua and none of the codes presented has worked for me, i found a promising one but when i gave it a try it didn't work

Here's the code:

game.Players.PlayerAdded:Connect(function(plr)
script.Parent.Touched:connect(function(hit)
 if hit.Parent:FindFirstChild("Humanoid") then
  plr.PlayerGui.questchat.Teleport.Visible = false
  wait(2)
  plr.PlayerGui.questchat.Teleport.Visible = true
 end
end)
end)?

At first i thought it was a problem with the names of the GUI and frames but everything checks out and still no output, no change of properties and no popup or closure of the GUI

Hello. This script will only work without filtering enabled.

script.Parent.Touched:connect(function(hit)
	if hit.Parent:FindFirstChild("Humanoid") then --checks if it is a player
		local char = hit.Parent --gets the character
		local plr = hit.Parent::GetPlayerFromCharacter(char) --gets the player who touched the part
		plr.PlayerGui.questchat.Teleport.Visible = true --Sets the gui visible
	end
end)