How to install a wallpaper?

Windows

1. When the picture appears in your browser, click the right-hand button on your mouse 
2. On the menu that pops up, select set as wallpaper or set as background

Mac OS X 

1. When the picture appears in your browser, drag it onto your desktop 
2. From the Apple menu select system preferences 
3. Select Desktop 
4. In the pull-down menu marked Collection, select Choose folder 
5. Locate the chosen picture file and double-click it  

How to delete wallpaper
 
Windows (Internet Explorer)

1. From your desktop, click My Computer 
2. Once the window opens, click the following folders, in this order: Local Disk (usually C: drive)
   • Documents and Settings
   • Your Username
   • Application Data
   • Microsoft
   • Internet Explorer 
3. In the Internet Explorer folder, you will find a file called Internet Explorer Wallpaper.bmp 
4. To delete this file, click the file name with your mouse, then right-click and scroll down the menu to the delete option. Or simply hit the delete key on your keyboard 
5. The wallpaper image will remain until the computer is restarted. To delete from view without restarting the computer, right-click anywhere on an open area of the desktop, scroll down and select Properties. (This will open the Display Properties window.) Click on the Desktop tab, select a different background and click OK. This will change your desktop background immediately.

Mac OS X 

1. Locate the Applications folder in the Macintosh hard drive and choose System Preferences 
2. Select Desktop & Screen Saver. This will show you what wallpaper is currently displayed on your desktop 
3. To change the current photo, select a new photo from the drop-down menu 
4. To remove the photo permanently from the desktop, locate the photo on the hard drive and drag it to the trash. This will delete the image