Requirements : Class/Job
Disciples of War or Magic Lv. 50
(and Stormblood license ofc)

Quest Giver : Ul'dahn Citizen
Ul'dah - Steps of Nald X: 9.2 Y: 9.1

For me it's clear, unless you still haven't understood that you can see your position on the map/mini map x/y.

source: https://eu.finalfantasyxiv.com/lodes...777.1546708479