Step 16: You are led through some more steps which I hope are self-explanatory: setting the time zone, adding an initial user account, and so on. When you see this screen, congratulations. Reboot, login, and continue with the terminal to install updates and additional software such as subversion.
As a post install step, go to "Devices → Install Guest Additions". This will allow you to go fullscreen and has other helpful features. ←