How do you show who killed you as a popup GUI?

Okay, the picture I am looking at is the same general thing as Base Wars: The Land, so players can know who killed them. I started looking at it and this is what I got when I attempted to script it. Please help me out with this, it means alot. :)

Note: I want both to appear on the same popupGui.

local.findFirstChild
	function.onDeath.humanoid
	check.local.killer
		if killer(true) then
			local.Display.gui
		local.vector{1,0.5,1} color=(0/255/255)
	display.{USERNAME}.killer
		wait(5)


local.findHumanoid
	function.onDeath.humanoid
	check.local.(usedWeapon)
		if weapon(true) then
			local.Display.weapon
		local.vector{1,0.5,1} color=(0/255/255)
	display.{WEAPONNAME}.weapon
		wait(5)

end
	end
		end)

Thank you for any support. This is the first script I made without looking and copying others' stuff into it. Please help me touch it up so it pops up a GUI :)

There are SO many things wrong with this script. Sadly I have no idea what the heck is going on in there so I can't help. Maybe actually learn how to script Lua before you try to script in ROBLOX, because that is certainly not Lua, it's just a bunch of non-sense.