2. Slide down, find the wallpaper, and then click to enter:

3. Choose a new wallpaper:

4. Select the album of screen saver pictures you want to change:

5. Select the screen saver you want to replace:

6. Click Settings:

7. According to your own preferences, choose to set the picture as a screen saver for lock screen, or a screen saver for home screen, or set it at the same time (taking simultaneous setting as an example):

8. After selection, you can see that the screen saver of the home screen is already a selected picture:

9. Lock screen is also a picture selected as a screensaver.