After a very restful night, Tabrina teleports you back to the entrance to the underdark the next morning.
After making your farewells, you head back down the passage.
By late in the afternoon you are back at the first major intersection of passages...where you turned northeast on your first visit. This time, Jo-owrn directs you southwest, down another major passage.
You travel about a mile down this passage, then find a cave to rest in for the night.