How to change my ability of world starlight magic star?

Buy a replacement from the Magic Star Exchange in the game. Star ability is a new ability that players gain when they stand on the singing platform and the constellation * * * is activated. After the player successfully obtains the star ability, he can open the star mang book and click the star ability tab. At this point, you will see the circular tree diagram below. When the player wants to change it, he must go to the magic star exchange in the game to buy it.