Any time a character or creature wants to activate an Extraordinary Ability, they must pass an activation roll. The character rolls their Shaping + Aptitude vs the TN listed for the ability. If they pass, it works! If they fail, nothing happens and they waste their action.
A character can elect to spend a point of Shaper Energy to automatically pass their activation roll.
Once activated, the character may still need to make a separate roll to hit or otherwise affect another character as appropriate. This will follow the usual Attribute + Aptitude format and will be listed in the Description for the Ability.
By default Extraordinary Abilities have an instant duration. That means they are only active during the round of activation. A good example of this is again the classic fireball.
Duration can be increased by using the Duration or Maintained Effects.