Follow the passage through the tunnels and into a clearing. By using this Spell, you will be able to use the elevator by interacting with the lever inside and head on down into the heart of the passage. In order to fix it, use the Spell Revaro. Once inside the Secret Passage, you will see a broken elevator. All you need to do here is interact with the Statue in which the protagonist will use the Spell Dissendium. Just before the Floo Flame and between this Fast-travel Point and the Spiralling Staircase, the One-Eyed Witch Statue can be found. You need to head into towards the spiralling staircase and continue walking south, heading directly towards a Floo Flame. The Statue can be found on the third-floor corridor, just south-west from Weasley’s position.
Upon speaking with Garreth Weasley, your first goal is to find the One-Eyed Witch Statue and unlock its passage. How to Explore the Secret Passage in ‘Dissending for Sweets’ Quest
