I don't have any information on how to set an HD wallpaper as your background. However, I can suggest some general steps that might help you achieve this on a device with a graphical user interface (GUI) like a desktop computer or mobile phone.

### For Desktop Computers:

1. Right-click on the desktop and select "Personalize" or "Display settings."
2. In the Personalization window, click on "Background" and then select an image from your files.
3. Choose the HD wallpaper you want to use by selecting it in the file explorer.

### For Mobile Phones:

1. Go to your device's Settings app.
2. Scroll down and find the option for Display or Wallpaper.
3. Select "Choose a new wallpaper" or "Set as wallpaper."
4. Choose the HD wallpaper you want to use from your gallery or select a new one.

Note: The exact steps may vary depending on your device's operating system (e.g., Windows, macOS, Android, iOS).