The Security tab you see inside the Edit contact or Create Contact window allows you to:

  • Select which users can have the following access to a contact record by dragging and dropping the user names into the permitted users/groups areas on the right-hand side as shown below: 

You can limit the permissions users have by checking the check boxes to allow/deny users to 'Create', 'Read', 'Update' or 'Delete' a contact. 

By default the Security setting is set to 'Everyone' (all users) unless otherwise changed.