I have earned charms such as flippendo and incendio but they don’t show up as options, how can I..

Have you collected them as complete? ...when you finish a class you click your characters face at the top left of the screen, on the next screen you choose the book at the very bottom right corner... you have to do that in order for it to be available i believe. Otherwise, I would contact support; again, click the charaters photo at the top right corner, the on the bottom click the gear. It pops up a smaller screen with 2 tabs at the top, choose support, then help. you will have to turn your device veritically and click the message icon at the top right. And remember to keep an eye on that for responses if you do not have notiications set up for the game (or even if you do, just incase because they will close the issue if they do not hear back quick enough. I hope this helps, if you havent already figured out your issue.