The above application is pretty straightforward. Download the program and follow the instructions.
Make sure to backup the contents of your flash drive as it will be wiped. All your data will be permanently erased.
Once the application has finished successfully, you have a bootable flash drive. Plug it into the PC you want to install the OS on and see if the PC will boot from the pendrive. If so, follow the instructions.
If not, you must go into the BIOS (typically, press DEL or F2 as you boot) and change the boot priorities to have:
1. Your USB Drive
2. Your Hard Drive
If you have anymore questions, don't hesitate.