How to set a custom background picture for SMS in oppor5?

Menu, settings, profile, general mode, options, personal settings,

Ringtone settings, information (then just choose what you want)

If you don't see the downloaded ringtone:

Menu, file management, memory card (depending on where you put it),

My music, find the ringtone you want, options, send,

Enter scene mode and confirm.

Then you look back and there it is.

~O(∩_∩)O~