When you finish the quest to graveyard and get your reward from the rich man after the trial. Go to the left where the bar in the rich area is and ask about the dock to the bartender.
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(Spoilers for anyone who is doing it themselves.)
In the trial, always object never wait for anything.
Objection 1: Show them the key (to let them know it is a job)
Objection 2: Let them know that you got permission from the head guard to go into the graveyard.
Objection 3: Show them show the dark orb that was dropped from the wraith.