If you need to change your username, update your email or password,
or adjust any of your account information, click Account at the top of
any page and select Account Settings in the dropdown menu that appears. Manage your Account Settings
Protect Your Account
As always, we recommend that you change your
password periodically to stay safe online. If you think your account has
been compromised or if someone else has access to it, we recommend
resetting your password. To reset your password:
Scroll down to Password, click the “change” link, and follow the instructions.
Control Who Sees Your Information
Use your privacy settings to control who gets to see your posts and
timeline. You can also specify privacy for a specific message or post,
and control how much information you share with applications (such as
games and quizzes). To get to your privacy settings, click Account at
the top of any page and select Privacy Settings in the dropdown menu
that appears.
Unfriending Someone
You can remove a connection to a friend that you are no longer
comfortable sharing with. If you’d like to remove a friend, navigate to
the person’s timeline and click the gear icon on the right side of their
timeline and select "Unfriend." If you decide later that you’d like to
be friends later, you can send them a friend request.
Blocking Someone
If you are being harassed by someone or if you just don't want be
visible to them on Facebook, you can block them from your timeline. When
you block someone, it breaks all ties you have with them (friendship
connections, friend details, etc.). The two of you will no longer be
able to see each other's timelines or find each other in search results.
To block someone, go to the block list in your Privacy Settings,
use the "Report/Block" option under the gear icon on the right side of
their timeline, or use the Report link associated with the message in
your inbox (or found on any content they post).