Problem with Achivement script

[sunde]

Hi!
i have problem i dont know where to paste achivement script to Svargrond Arena i got Svargrond Arena Mod : http://otland.net/f163/mod-perfect-svargrond-arena-system-64968/

and i want to enter this script:

function onKill(cid, target, lastHit)
	if lastHit and isMonster(target) and getCreatureName(target):lower() == 'orcus the cruel' and getPlayerStorageValue(cid,76225) == -1 then
	 doPlayerSendTextMessage(cid,22,"Congratulations! You earned the achievement \"Greenhorn\".")
		doPlayerAddAchievement(cid, 25)
		doCreatureSetStorage(cid, 76225, 1)
	end
	return true
end

from that theard http://otland.net/f81/achievements-pack-132764/

Please to fast answer,
Sunde