You can choose if your profile should be visible for all visitors of the community or only registered users. To do so, open the account settings by clicking on your name in the top right corner and selecting “Account settings”. Then choose “Settings” in the left column. There will be a drop-down menu to set the visibility of your profile to others.  To change how others may interact with your profile and posts, open the account settings by clicking on your name in the top right corner and selecting “Account settings”. Then choose “Permissions” in the left column. You can then choose what your friends, other users and unregistered users may do with your profile.