How to change lock screen wallpaper in Gionee S6s

1. Click on 3 dot on the bottom left corner of the lock screen.
2. Click on subscribe button
3. Click on setting icon
4. Click on Choose a local wallpaper
5. Enter your password
6. Select one of the picture from your gallery
7. Select portion of picture  you want to display on lock screen as wallpaper
8. Finally click on apply...

In this way you can change your lock screen wallpaper in your GioneeS6s.