Help! how do I set this as my desktop?

Step 1: Find out your current desktop size.
Right click on your desktop and choose properties,
choose settings, you will find you desktop size
in the desktop area panel.

Step 2: Decide on the desktop design you want,
using the next and previous buttons.

Step 3: Click on the link below the preview
relating nearest to your desktop size,
the image will open in a new window, just right click on the image
and select 'save as wallpaper/background'.

Step 4: Recommend this site by using the 'Send to a friend' link .