In Royale High , you don’t equip “fairy power” by the obby itself; you usually unlock or change powers through the elemental system, then select the one you want from your powers wheel or journal. One guide says the powers wheel shows unlocked elements, and you can fill empty slots by earning level rewards or buying the unlocks with diamonds; it also notes that some extra powers are obtained by finishing the related elemental obby and then claiming the reward.

What to do

  1. Finish the fairy/elemental obby for the power you want.
  2. Go to the area where powers or elements are managed.
  3. Open the power wheel or journal and equip the unlocked element.
  4. If the new power is still locked, check the level reward requirement or diamond cost.

Important detail

A forum reply says you can’t change your original power freely , but you can learn other powers through books or similar unlocks in your journal. That matches the guide showing extra elemental powers being added through progression rather than swapping your first choice instantly.

Quick Scoop

If you’re stuck after the obby, the usual fix is to go back to the elemental/power menu and claim the reward there, not to redo the obby from scratch unless the game requires a specific completion step.

TL;DR: Complete the obby, then open your powers/elements menu and equip the unlocked fairy power there; if it’s missing, check level rewards or the journal unlocks.