In this quest you need to talk to several NPC's in Wajjun Bazaar. After which you will be sent to the Undercity to talk to Master Togo. Master Togo will then redirect you to the next mission: Vizunah Square (Local Quarter). However there's a whole army of Afflicted between you and the portal. After you've fought your way through the Afflicted you must speak to Guardsman Pei to travel to Vizunah Square.