Help with a PHP Mailer Form on Kirupa.com

I am having trouble with this PHP form mailer… when ever I try to use it to test it… it goes to a page like this:

Method Not Allowed

The requested method POST is not allowed for the URL /mailer.php.

I dont know what this means… but it probably has something to do with me using a free hosting service… I just want to know if there is something else im doing wrong wrong before I start my paid hosting service

THX

~Psych