グランドマスター レインス:
To become a Warrior, you need the appropriate level and token. Your level must be at least 20 to qualify to change profession. You need the medallion of the Warrior to prove that you passed the Test of the Warrior, as well.
I am satisfied with your level, but it seems that you have not passed the Test of the Warrior. You will only be accepted as a true Warrior after you pass the test. Go ask Master Auron in the village of Gludin.