I haven’t looked close enough to see how Zeroshell is managing passwords, so this might not work:
Try the standard way into a Linux box when you have console access: Boot into single user mode, change the root password there, then boot the box normally. If you are lucky you can then use the root password you just set to access at least the shell.
1)Turn off your computer then press F8 keep doing it when you see a black screen it will tell you to go in to safe mode push that one puss enter again and then it will give you some codes just egnore the codes then when you have your login screen push “Ctrl and Alt” and delete push those botton at the same time do it again and again before you see another screen come up. it will tell you to type in your user name, and password will the username type in Administrator and for the password don’t put nothing on it, okay push enter there as you go.