You can change your email by going to your Account Settings - it's right at the top of the page. As for username, click on it right here at the left which will bring up your profile. From there you can edit it.
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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 .