Ok. Now let me guide you through the process. You cannot see that information INSIDE Windows 10. You need to boot the computer into BIOS/CMOS screen.
Please restart the computer and then as it is restarting, press the Del key and keep tapping it until you see the BIOS screen. If Windows loads, try to reboot again and press F2 and keep pressing F2 instead of Del.
When you are in the BIOS screen, navigate using the arrow keys if your BIOS screen does not support the mouse.
Then locate the section on the BIOS/CMOS that says something like "Boot Order" or Boot Sequence.
Set the DVD drive there as the FIRST boot option.
Save and Exit and load the DVD on the drive. The installation shall start.
Here is a video sample of the CMOS/BIOS settings:
I hope that helped.
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