The easiest way to retrieve files is from the Code 42 Crashplan application.
Launch the Crashplan application in the Applications folder, then click the "Restore Files" button.
Within the interface, navigate to the file or folder you want retrieve. Check the box next to the file or folder to retrieve.
By default the most recent version is restored. You can choose to restore your data as it was on a specific date by selecting a day on the calendar.
Click "Restore Files.." and options will be presented for a location.