Though there is a default setting for all of your different privacy functions within the site, you can change any of your Privacy Settings to your preferred level of privacy at any time.  You can change your privacy settings under your Profile.  Access to your Profile can be found in the upper right-hand corner of the site, from your Personal Navigation Bar.

Note: If you do not see the "Profile" link in the upper right-hand corner of the site, you are likely not signed in.  When you sign into the site, then all the links in your Personal Navigation Bar will appear.