When you are on the home screen, drag two fingers from the top of the screen to show the quick settings menu. Here you should have an option for 'Auto Rotate' which you can tap to switch on and off. Does this work?
When you are on the home screen, drag two fingers from the top of the screen to show the quick settings menu. Here you should have an option for 'Auto Rotate' which you can tap to switch on and off. Does this work?