You have spoken with each of the Rangers whose names Master Elrond provided and should report now to the Elf-lord of your success.
'You have come a great way, ${PLAYER}, to bring your message to the Dúnedain. Golodir and I will inform the rest of our kin here in Angmar, and we will make haste to join the Grey Company.
'You should return now to Master Elrond in Rivendell, that he may be told of your errand's success.'
Master Elrond is in the library of his house, in Rivendell.
You have brought word of the Grey Company's need to the Rangers spoken of by Master Elrond and should return now to him.