problem in installation of phpLinkDir

When I add link, I cannot see the "visual confirmation security code"
What is the problem ?

http://directory.22webhosting.com/submit.php

Thanks

 

The captcha is created by GD Library or ImageMagick. You need to find out from the install notes to phplinkdir which it requires and if they are installed on your host.

 

Thank yuo very much. I disable it temporary.