Problems blogging with Flickr

Hi, I’m using WordPress 1.5.1.2. I’m having trouble blogging my photos in Flickr. I get the message:

“The username and password you entered do not have any weblogs associated with them.”

although I am sure I am using the correct username and password. In fact, I get this message no matter what userid/passwd I use. When I manually go to my site: https://kevin.saff.net/xmlrpc.php I see the following message:

“XML-RPC server accepts POST requests only.”

Is this what I should see? Anyway, I am also running PHP 4.3.10, if that helps.

I was able to post photos to blogger before I switched; I have not yet been successful with wordpress. What diagnostic steps can I take to see what’s wrong?