Changing the boot order of the "bootable" devices on your computer like your hard drive, floppy drive, optical drive, etc. is very easy. The BIOS setup utility is where you change boot order settings.
Turn on or restart your computer and watch for a message during the POST about a particular key, usually Del or F2, that you'll need to press to ...enter SETUP. Press this key as soon as you see the message.
After pressing the correct keyboard command from the previous step, you will enter the BIOS Setup Utility.
All BIOS utilities are a little different so yours may look like this or it may look completely different. No matter how your BIOS setup utility appears, they are all basically a set of menus containing many different settings for your computer's hardware.
In this particular BIOS, the menu options are listed horizontally at the top of the screen, the hardware options are listed in the middle of the screen (grey area), and the instructions for how to move around the BIOS and make changes are listed at the bottom of the screen.
Using the instructions given for navigating around your BIOS utility, locate the option for changing the boot order.
Note: Since every BIOS setup utility is different, the specifics on where the boot order options are located varies from computer to computer. The menu option or configuration item might be called Boot Options, Boot, Boot Order, etc. The boot order option may even be located within a general menu option like Advanced Options, Advanced BIOS Features, or Other Options.