Use the "Go" tab - Personal Zone - Profile to get to the Profile page. Click on the "View/Edit Complete Profile" at upper right. Sig is at the bottom and requires permission from Auctiva.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .