The "Burning Longhouse" card says "As a Free Action a player may place 1 [Burning Token] on their Hero Charter to place 1 [Objective token] on this card.
I searched the rules, but the only types of actions listed are: Regular Action, Fast Action, and Reflex.
How do Free Actions work? Only during a Hero Turn (like Regular & Fast)? Only once per turn (like Regular)? Can you also take a Regular action (you can if it's like Fast or Reflex, but not if it's considered a Regular action)?