Have you attached this script to anything? What compiler error are you given when you try to compile it with "extends Quest"?
Cipscis

Scriptname NoFastTravel extends ObjectReferenceEVENT onInit() EnableFastTravel(false) Debug.MessageBox("Hello, world!")endEVENTScriptname NoFastTravel extends QuestEVENT onInit() EnableFastTravel(false) Debug.MessageBox("Hello, world!")endEVENTScriptname DefaultNoFastTravelTriggerScript extends ObjectReference {block fast travel while the player is in this trigger}import gameEVENT onTriggerEnter(objectReference triggerRef) if triggerRef == GetPlayer() Game.EnableFastTravel(false) endifendEventEVENT OnTriggerLeave(objectReference triggerRef) if triggerRef == GetPlayer() Game.EnableFastTravel(true) endifendEventScriptname NoFastTravel extends QuestEVENT onInit() EnableFastTravel(false) Debug.MessageBox("Hello, world!")endEVENTScriptname NoFastTravel extends ObjectReferenceimport gameEVENT onInit() EnableFastTravel(false) Debug.MessageBox("Hello, world!")endEVENT