You will need you restore disk that says Mac OSX install insert that into your mac. Then go to the apple icon and select shutdown. Then restart your mac and hold down the c key till you see the apple icon AND spinning gear. Once the disk loads ( takes a min or 2) Select your language then from utilities ( above the install window) Select reset password. Then select mac hd followed by your user name. Then set the new password XXXXX save. Close out all windows and restart. You have now reset your password.