From Orbis: Go to Orbis Station & talk to the Ticketing Usher (the NPC who lets you into the various cabins, NOT the ticket seller NPC) and select the option letting you go to Mu Lung Town.
From Aqua Road: Talk to the Dolphin Taxi NPC and pay mesos to go to Herb Town. From Herb Town, talk to the Warp Assistant (the Crane NPC) to get a ride to Mu Lung Town.
