Grand Master Aldenia:
To become a Human Knight, you need the appropriate level and token. Your level should be at least 20 to be qualified to change profession. To become a Knight, you need a token to prove that you passed the Test of the Human Knight, in addition to an appropriate level. I am satisfied with your level, but it seems like you did not pass the Test of the Human Knight. You can only be accepted as a true Knight when you pass the test. If you want to know more about the test, visit Sir Klaus Vasper, who is one of the high-level Knights in the village of Gludin. He can be found near the fighter guild of Gludin. You can change profession to Knight if you pass his test and bring back the sword of ritual.