Speak with Mokra the Skullcrusher at the Argent Tournament Grounds to become a valiant of Orgrimmar.
You've proven yourself worthy of competing under the banner of Orgrimmar, <name>. Now, you should speak with Mokra the Skullcrusher, who leads Orgrimmar's competitors. As Orgrimmar's grand champion, he will enter you into the tournament on behalf of the city and oversee your training and testing as valiant.
It has been an honor working with you, <name>, and I wish you luck in the competition ahead.