How to change the ringtone of lg p970 SMS? I still can't change it after class every day, so I have to use a ringtone that comes with my mobile phone, and other settings are still the original rington

How to change the ringtone of lg p970 SMS? I still can't change it after class every day, so I have to use a ringtone that comes with my mobile phone, and other settings are still the original ringtone. Create a media folder in the SD card, create an audio folder in this folder, and create a notification folder, a ringtone folder and an alarm folder in the audio folder. After putting SMS ringtone, incoming call ringtone and alarm bell, select it in the system settings. If not, please try again. That's how I got it. It's all p970.