Have followed your instructions and have come up with differences as follows:
1. USB device icon shows up on right hand side of desktop
2. When I click on finder I do not find my name. Rather a list of options such as About Finder, Preferences, Empty Trash, Secure Trash, Service (a long menu of things) and then all in faint lettering Hide Finder, Hide Others, Show All.
I tyhen went to the Macintosh HD icon and clicked on that that showed me a list of Folders on the left side of the screen such as Documents. Pictures, Music, etc.
Can I simply drag each of them to the USB device and if so, when will I know the transfer has been completed? Also, by dragging the folders to the USB device will their content remain on my Mac?