To make the image below your desktop wallpaper:
Right-click on the image below;
Left click on "Set as Desktop Background" (or "Set as Wallpaper")
Easy as that, and yes, you can change it easily. See all Jen's Christian wallpapers at "Desktop Wallpapers".

Psalm 23:2-3a: "He makes me lie down in green pastures, he leads me beside quiet waters, he restores my soul."