HDDR is located at Fort Wilderness, not Wilderness Lodge. There is no bus to FW, so your only direct route is the FW/MK boat. All boat docks are clearly marked at the front of MK, recent posts indicate the FW dock has moved and is now the farthest to the right(facing the docks), just in front of the monorail. In any case Disney marks the transportation stops clearly, so just stop a moment and check the signs.
Once you arrive at FW, HDDR is just a short walk from the dock, you will see it to your right as you exit the marina.