I don't think you need one, just hop on the ship in Mhaura. (been a LONG time since I've done this but think it's all you do)
One thing to watch out for is that the ship you're boarding is going to Selbina and not Aht Urghan. If you get on the AU ship it will kick you off without a boarding pass. But if it's a Selbina bound ship, you should just hop on.
- Sylph Reinvented WHM 90