1. Turn off your computer and turn it back on (if you have fast-boot enabled, you'll need to turn it off) and watch for text along the screen that says something along the lines of "Press F12 to Choose Boot device" (your key may be F9 or F2). Wait for a list of options to pop up.
2. Select the option for your USB drive. It may be the name of the os or the name of the USB drive. Press enter and select "try without installing" to run the OS in "live mode" straight from the USB.
Check out our Live usb line up at http://www.bnrtx.com/store/c2/Bootable_8Gb_USBs.html