Use of the data recovery software included in Ubuntu-rescue-remix is detailed here:

http://help.ubuntu.com/community/DataRecovery

A shortened version of that page is found on the cd as a file named CheatSheet.txt. The cheat sheet in in the /install directory on the live cd, as well as in /root from within the live cd session.
So to view the cheat sheet once you have booted Ubuntu Rescue Remix, run
cat /root/CheatSheet.txt | less