I installed the AntiSpamSFS 1.3 Plugin, configured it at "Edit Config". There i had have create a new Form for the Blog Article Add Comments. Am I now have protected the Blog Artikel Add Comments? Have i had do it right? I am unsure!
That is what i have had selected and typed in in Home>Administrator>Manage Forms:
Name : Blog
Description: Against Blog Spamming
Pagetitel: Blog (special_blog)
Use Email: yes
Email Alias: nl_email
Username: No (by the Way, in the Configuration Sektion i have had selected Names : No Email: yes IP: yes)
Username Alias: i leave it blank
Looks like the General part of the form is ok.
In the Control part, the cmd property is needed, it should be set to Add Comment.
In the Criteria part, the email is not needed (there is no email field in the comment form) and the Use Username and Username properties can be set to Yes and name respectively.
Hope this helps.
PS: There is a screenshot in the plugin page that shows how to fill the form for SimpleBlog: