The action bar at the bottom of the screen contains your spells, special abilities, or frequently used items like Food and 9 Dragons Gold Water (which give back health and mana respectively). You can activate these by either left-clicking on them, or by typing the number corresponding to the slot of the spell or ability you wish to use. Mousing over the icons will also show you a tool tip containing the name of the spell or ability. You can also consult your spell or ability books (Spell book & Ability button on the Action Bar) to get a full description of each ability or spell your character may have. You can re-arrange your Action Bar by clicking and dragging on the icons. You can also add new spells/abilities to this bar as you receive them by dragging them from your Spell or Ability book. You can also place items in the bar for easy activation.