Ubuntu 11.10 on a USB drive

[Lenny]

Hi,
I used the Universal USB installer for Ubuntu 11.10.
I haven't booted to it yet.
Seems like the commands to boot to Orca were F5, then press #3, and press 
enter twice.
Is this still the case, or did I get it wrong?
Also, I know it has been asked recently, but I looked in my past messages 
and haven't found it yet, but how do I drop back to Unity 2D?
Thanks.
Glenn