From the Store tab, click Customize Your Store, then click the button for Select/Edit Style 2, then the link to edit your contact information should be next to bubble #3 on that page
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 .