Install and open the daily P-picture software on the mobile phone, then click the "magic matting" option, select a template in it, click the matting option below, and go to the local photo library of the mobile phone to select photos with matting to change your mouth. Select Quick Select. After completing the quick selection, click the check option in the lower right corner to adjust the size and position of the lips. After setting, click Save in the upper right corner.