Okay, you should be able to see your thumb drive easily in one of two ways. Either boot to the CD/DVD with the thumbdrive already plugged in or plug it in after the desktop has completed loading and wait a few moments. Now, you should see something referencing [sda1] (or [sd(b - z)] depending on your configuration). You should then be able to right click and mount the drive. Then right click it again and navigate the menu structure to make it writeable (>Actions >Change read/write mode and then tell it "yes" when it asks). At this point you should be able to drag and drop, cut and paste, whichever method makes you happy.

HTH,

'Goon