To boot from your newly created USB drive, you must instruct your motherboard to prioritize the USB port over your internal hard drive. Restart your computer.
According to a BetaNews review: "It's a full stand-alone version of Partition Manager, optimized for virtual disks, that includes all the drive management features you'll need: partition tools, defrag, backup and restore, a host of essential troubleshooting and disaster recovery tools and much, much more." To boot from your newly created USB drive,