It’s driving me insane. I’ve got a new iPhone and every time I click “sign up”, it just says loading. I need to click it so I can find the “already got an account?” part but nothing. I’ve done the tutorial all over again etc etc, reinstalled, cleared everything but nothing works 
help!
Sorry to hear you have issues with this!
If you already have a Blizzard account, you should be able to just login without having to click the “Sign Up” button. If however that is all you see, you may be able to resolve the issue by shutting down your phone (not a restart!) and then starting it again.
If this does not work, please do let us know the model of iPhone that you have and if you have tried on a wi-fi and mobile connection.