The UEFI/BIOS provides the simplest method for turning on Secure Boot. You can enable secure boot to install windows 11 by simply turning on one of the several settings that are normally available in the BIOS.
As soon as your computer or laptop starts to turn on, restart it and then continuously click the keyboard entry key to enter the UEFI/BIOS. The actual key may vary depending on the motherboard and system manufacturer, although typical methods include Del, F2, F10, F11, and F12.
Consult your motherboard or system handbook, the website of your manufacturer, or even other sources for specific explanations on how to enter the UEFI/BIOS. If you'd rather, you can also utilize the Windows Boot Manager.
Select the Advanced mode if your UEFI/BIOS offers both a limited and advanced mode.
Look for a tab labeled "Boot" or "Security" at the top of the screen. One of those options most likely contains the Secure Boot option.
Until you locate the Secure Boot option, search through the list of options in the active tab. If it can be toggled directly, choose and then choose Enable.
Press the shortcut key for storing changes if your UEFI/BIOS has one. Alternately, choose Save by going to the Save and Exit tab.
Press the shortcut key to save and exit when you are assured Secure Boot has been enabled, or alternatively navigate to the Save and Exit menu and choose Save and Exit. If prompted, click the "Save" button.
It's possible that your system is too old to support Secure Boot if you can't find that option in your UEFI/BIOS. Even so, it's possible that you can make that available option by updating your UEFI/BIOS firmware.
Explore the website of the company that made your system or motherboard to see if there is a suitable update for your device and see if that's possible.
The same procedure as before can be used to disable Secure Boot. To switch off your BIOS, enter it using steps 1-3 or choose Disable.