I recently register myself for exam.The following were the steps I took to make it meet the conditions to be acceptable for registration.
1.You request again at registertion section as Marko adviced.
2.Also put two messages outside of registration section like Greetings etc.
3.Also enroll yourself to student group 002 by clicking your log in name on top right corner,drop down,click "panel de control".In control panel,click "Groups de usuarios" tab.
Scroll down to locate "002 mensajes colocados ".On right side active the button and at bottom right press "ENVIAR" will enroll you for user group 002.Hope this may help.