Use the People Finder feature to search for a
  particular user.
    When you find the user you are looking for you can use the Follow/Unfollow action. You
      can also view their user profile. 
    - Click People on the toolbar.
 - 
        Type a full or partial name in the search box.
        
You must enter at least one character. The search is not case sensitive.
Note: See the search tips provided on the People Finder page to perform more complex searches. - Click Search.
 - In the results list, click a user name to display that user's profile.