The Boot Menu can be found in the System Setup.
Turn on (or restart) your system.
When the blue Dell logo appears, press <Del>.
If you wait too long and the operating system begins to load into memory, let the system complete the load operation. Then shut down the system and try again.
More info, HERE
I tried that and it worked. I have another problem though. How do I boot from a flash drive, like I would from a CD? Don't worry, I already made the Flash Drive boootable, and it works. I tried it on another Computer. So is there any way to boot from a Flash Drive?