Click on your gallery, select your picture (press firmly - depending on the picture you may see a bright line that outlines the picture if you see that - then menu, bottom left corner looks like a drawer, choose set picture as, choose lock screen wallpaper, picture will then show a 2 vertical lines left and right sides, with squares and blocks ( that supposed to be there) choose done, it'll then say, setting wallpaper, back out to your home screen, press the turn off screen (right side), press again to turn back on. Ta Da
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