(example: http://www.SomeSite.com/SomeImage.jpg)

To get an image's URL:

Internet Explorer:

• Right click the image
  
• Left Click 'Properties'
  
• Hold down the left mouse button and select the URL from the Address field
  
• Paste the URL into the form field
• If the image is also a link, you'll have to do a 'View Source' and copy the img tag

FireFox:

• Right click the image
  
• Left click 'Copy Image Location'
  
• Paste the URL into the form field
• If the image is also a link, click 'Tools', 'Page Info', Media tab, right click and copy the image you want