After you meet Ahtbyrm, he asks you to look for a member of his crew.
This quest is only available if you started the game in Limsa Lominsa, you have completed the quest On to the Drydocks, and have reached level 12.
Starting the Quest
Talk to Ahtbyrm in the Moraby Drydocks in Lower La Noscea to start the quest.
Journey to Candlekeep Quay
Go west, down the stairs, up the short flight of stairs on the left, and continue going south. Go up the stairs past the aetheryte, and go out the gate on the right. There are several roads. Go west along the road that goes under a natural stone arch. Then turn left and go through the gate to reach Candlekeep Quay.
Target Haldbroda and use the /doubt emote to complete the quest.
Next Main Scenario Quest
After completing the quest, talk to Haldbroda to accept the next quest: Righting the Shipwright.