The Price for Improvement: A Promise

Speak to , agree to give your word, and receive your .
This is how you get your third class. Once you have talked to and promised your future aid, you may go to any class Instructor in the and choose your third class. Do not worry that his words imply he is replacing your Secondary class. It means that your currently active Secondary class will become the new class you choose.
If you are nervous about the way this is worded, speak to the first and choose "none" for Secondary.
If you have not looked since you dinged 20/20, you may notice you now have the skill . at now knows how to send you to . The two zones, and , are level 1 to 50, and the quests there should be saved to level your third class, but feel free to use the Daily quests.
It is important to note, as well, that is the home of the new Bag Quests and the new method to get Elite skills for 15-50.