Hello... I have been using my new MacBook Air (11 inch) for a little over a month now----trying to get used to it and somehow I now have other "users" on my machine. I suspect I got them when I migrated information from two Windows computers to the Mac. When I try to open the folders for those users I get the message that I do not have permission??? Three questions: how do I get permission to open those folders?; how can I delete those users and their folders/files?; and is their a way to disengage the need for a password every time I want to do something on this Mac? Thanks for your answers and patience.