I have a newer MBP (June 2011). I have used an Apple store purchased thumb drive to upgrade to OSX Lion. I have no particular problems I've noticed. However, when I bought the MBP, I did NOT use a password. I left it blank when asked for a password. I did this on the recommendation of the sales staff (not sure if he was a Genius as I bought it from an Apple retailer overseas). Whenever I am asked to enter my password (download an App for example) I simply hit "enter" when prompted. I have read many posts about RESETTING my password. However, all I think I need to do is to CHANGE it from blank to one of my choice. Simple enough, but I have an equally simple question. When I go to the system preferences, Users, and then choose to CHANGE my password, do I hit "enter" for my present password (blank) or do I "tab" past the place where I should enter the password? Maybe a more important question is what to do if my effort fails. If I somehow get blocked out, I understand I restart my MBP and press OPTION. Then, when presented with the recovery drive, I select that. What next?