After Neville and Professor McGonnagell talk to you in Hogwarts Front 2, enable the harrysuperjump in front of the school and go in behind the fountain thing in the secret room. Go to one of the corners and face the center of the room. Cast a spell into the center of the room and release. There should be an Alohmora. Face the fountain's back side and squeeze through. just as done in Hogwarts Front 1.