The Filtering button goes to the rules page. The g0,g1,g2,g3 rules are global and are not editable or adjustable by Domain Admins or users. However note that these rules push certain emails to the Spam folder. If that folder does not exist, these rules do nothing.
Note: The Spam foler is not created automatically. When a user is created login to WebMail and create the Spam folder, if wanted. Once created, you or the user cannot delete it. However, we at LCR can delete it. Just ask.
Please also read our section on how our spam filtering works from the help menu.