Abilities
Abilities are special attacks, heals, buffs, etc. that can be used in battle. Each Class has its own characteristic Abilities. Before an Ability can be used, it must be learned on the Class's Growth Ring and then assigned to your Ability bar.

[Learning Abilities]
Access the Class's Growth Ring by tapping Gear -> Class. If you have the required Proficiency, you can consume it to learn Abilities adjacent to ones you have already learned. If you do not have the required Proficiency, you can earn more by clearing Quests and through several other methods.

[Customizing Your Ability Bar]
Tap the "Gear" button on the footer menu, then the "Abil." button to bring up a list of all Abilities you have learned. You can then drag and drop them to your Ability bar, which is shown at the bottom of the screen.