First, read the English article below.

Press the "Save and Exit" key as specified by the key legend, then press the "Confirm" key when prompted. For example, you might press Esc to save your changes and then press Y to confirm that you want to save and exit. If your computer doesn't boot from the USB flash drive the first time, it might have already selected your hard drive as the boot location. If so, you'll need to restart your computer (with the USB flash drive plugged in) before proceeding. Once your computer recognizes the USB flash drive as a bootable location, you should see the USB flash drive's installed program, service, or menu appear. When the menu appears, you can proceed with running and/or installing your USB flash drive's program or service. 

Now, please write a short abstract for it in Chinese. Abstract:
保存更改并退出BIOS。 如有必要，重启电脑。 等待USB程序菜单出现。 按照屏幕上的说明操作。