Type in your admin password to continue and the Enter again. After you get it in there, just hit the Enter key. Note that you should replace the 'Yosemite' in 'Volumes/Yosemite' with whatever you named your USB drive. With your USB drive ready to go, open up Terminal and type (or copy/paste) the following command.
To see how to correctly format your USB drive, please see Step #1 below in the 'The Hardest Way' section. Just make sure your USB drive is already formatted correctly before proceeding.
If you're more comfortable with Terminal commands, this is the method for you. If it's more toward the latter, you might get a ' AppleEvent timed out' error, but it should still work, according to the developer (it worked for me). It could take anywhere from 15 minutes to to 45 minutes to finish, depending on your USB flash drive. Then just follow the rest of the prompts to start the disk-making process.
