The sd1 profiles are internal and can only be updated with new firmware. It's very easy to make a profile though from the menu. Choose a fixture that is similar to the one you want and edit it where necessary. You can copy the new fixture to other fixture slots too.
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 .