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".

Galatians 5:22: "But the fruit of the Spirit is love, joy, peace, an even temper, kindness, goodness, fidelity, gentleness and self-control."