How to set SMS ringtone for Gionee 5300?

Jin Li's mobile phone can't change the SMS ringtone. I used Gionee A 10. Cell phone ringtones can be changed, but information ringtones cannot be changed. And when browsing the memory card. For example, when I saw the middle picture, I deleted what I didn't like, and then I went back to the first picture. There is also the phone number in the mobile phone can not be deleted together, but to delete a phone number, you have to go back to the first one and start searching again! These points are uncomfortable for me to use.