Typing the characters from a picture helps ensure that a person—not an automated program—is completing the form.
This is important because attackers use harmful programs to try to utilize these pages to cause problems for other users, by sending junk e-mail messages or slowing down the service by repeatedly performing bogus requests.
In most cases, an automated program cannot recognize the characters in the picture.
If no image appears, please make sure your browser is set to display images and try again. If you are not sure what the code is, make your best guess. If you guess incorrectly, you can try a different code on the next screen.