Galadriel wants you to journey south along the river Anduin to see what fate has befallen the Fellowship, but for that you will need a guide.
'You will need a guide to bring you to the Falls of Rauros, but few of my people ever travel that far. No, do not shake your head in frustration! There is a guide who will suffice. His name is Corudan, and he is not called \qRiver-walker\q for naught: he is more familiar with the lands through which the Anduin flows than any Elf in Lórien.
'Find him on Telain Neduil, on the eastern side of Caras Galadhon, and tell him you need him as a guide along the Anduin.'
Corudan is on Telain Neduil in the eastern side of Caras Galadhon.
Galadriel has sent you to recruit Corudan as a guide along the Anduin as you investigate what has happened to the Fellowship.
Bordhrist is on Telain Galadhrim, and Faengalph is near the surrounding hedge not far from the entrance to Caras Galadhon, beneath Telain Glorelloth.
Corudan is waiting on Telain Neduil for you to return from arranging for a boat and supplies for the journey down the Anduin.
Nona is on the flets near the House of Celeborn.
Corudan has sent you to tell Nona you are ready to leave.