Hi, I am new to MacRumors and to Macbook Pro Computers. I have a iPhone and iPad Mini, & bought a used Macbook Pro from a friend. I can sign on to iTunes with no problem, but when I have operating system updates for the Macbook Pro it shows up with my friends Apple ID and I can't figure out for my life how to change it. I am hoping it is something simple that I am just overlooking. I have been updating using his email and password....but I really want to have it in my name. Do I have to take it to a computer shop to have them do it? I am pretty good with computers...but great directions would be appreciated. Thanks in advance.