Add Subclass:
You aren't eligible to add a subclass at this time.
To add a subclass, you must meet the following conditions:
First, you must obtain Mimir's elixir. To find out more about this quest, speak with Magister Ladd at the Ivory Tower of Oren
You must also have completed the "Fate's Whisper" quest from Maestro Reorin, you can find in a hut wast of Oren Castle Town.
Also, the level of all your subclasses must have reached 75. For example, if your current subclasses are Temple Knight and Silver Ranger must have reached 75 if you are to add a third subclass.
All characters are limited to three subclasses.