Travel to Agmar's Hammer in the Dragonblight and speak to Overlord Agmar.
Directly east of this refugee camp stands Agmar's Hammer - testament to the Hordes' power in the Dragonblight.
While I have no doubt that our Horde brothers and sisters are already seeing the result of your efforts to bring the taunka into the Horde, I want you to deliver news of your success to Overlord Agmar in person.
Go now, [player]! Race the winds! East to Agmar's Hammer!