To change your store window settings, click on the "Store" tab then "Edit Store Window". Here you will have the option to place the store window at the end of your description as well as many other options.
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 .