When u sit on a seat and a gui pop up(onTouch) help?

function onTouch(Part)
	wait(1)
	game.StarterGui.ScreenGui.Frame.Visible = true
	wait(1)
end

script.Parent.Touched:connect(onTouch)

This hasn't been tested.

script.Parent.Touched:connect(function(hit)
local hitplayer = game.Players:GetPlayerFromCharacter(hit.Parent) -- we must somehow get the player
if (hitplayer) then -- if what hit it was a player then
local screengui = hitplayer.PlayerGui:FindFirstChild("ScreenGui") -- defining the 'ScreenGui'
if (screengui) then -- if there a is 'ScreenGui' then
screengui.Frame.Visible = true -- making the frame visible
wait (4)
screengui.Frame.Visible = false -- making the frame invisible
		end
	end
end)

Hope it works for ya!