How to choose the first startup item of MSI motherboard?

MSI motherboard sets the first startup item:

1: Press the power button, immediately press the DEL key to enter the bios main interface, select advanced settings, and press enter to enter (some items are advanced BIOS functions).

2: Select the boot device priority and press Enter to enter. (Some are boot sequence items)

3: Select 1ST boot device, press enter, and set this as the device to be started, such as CD-ROM drive hard disk. (Some are boot options # 1, etc. )

4: After setting, press F 10 to save and exit.

Detailed operation pictures/questions/1242090271333877859.html