'The sons of Elrond have already left for Thorenhad to prepare for the coming journey. Elrohir did say that one of the Dunedain, a Ranger named Radanir, was stayong a few days at their camp. As Thorenhad is nearest to Radanir before seeking the others.
'I have met few of Aragorn's kin, but Radanir is known to me, for he journeys oft into the trackless Ettenmoors and often stays here in Rivendell. For a time, my brethren sought to convince him to join the company in song in the Hall of Fire, as Aragirn would, but Radanir would have none of it.'
You have been charged by Elrond of Rivendell with gathering the Aragorn's Duneadan kin throughout Eriador.
Pethelen has suggested a first step for your urgent errand: a visit with Elrohir at Thorenhad for an introduction to Radanir, one of the Dunedain currently staying at Thorenhad.
Elrohir has told you to speak with Elweleth, for she will know where Radanir the ranger has gone, if anyone will.
You have spoken with Elweleth at Thorenhad, and she told you where to find Radanir the Dunedan.
Radanir has agreed to join the Grey Company on its journey south to aid Aragorn, but he wants you to deal with the Orc raiding-party he tracked through the Trollshaws.
You have given Radanir the message for which you sought him, and he has agreed to join the Grey Company on its journey south. You should return to Elrohir now that you have dealt with the Orc raiding-party in the Laenan caves.