How to break out into shell

[feet1833-infradead at yahoo.com]

Following instructions on
http://www.bytebot.net/geekdocs/ibook/fedorappc.html,
I got to #13, "Once the installation is done, break out into a
shell. This can be done via Ctrl+Alt+Fn+F2. There should already
be an /etc/yaboot.conf file for you."

When should I break out into a shell? Is it a the screen when it
says "Reboot?"? I mistakenly chose reboot and my iBook hanged
and I shut it down. How can I break out into shell then?

Thanks for your help,
Soetji