Secure Boot can be enabled by accessing your computer's UEFI/BIOS settings and configuring the appropriate options. The general steps to enable Secure Boot include:

1. Check if Secure Boot is already enabled by typing "system information" in the Windows search bar and looking for "Secure Boot State."
2. Restart your computer and enter the UEFI/BIOS settings. This is usually done by pressing a key such as Delete, F2, or F10 during startup.
3. In the BIOS, navigate to the Boot tab or Security tab where you will find the Secure Boot option.
4. Make sure your boot mode is set to UEFI and that Compatibility Support Module (CSM) is disabled if applicable.
5. Enable Secure Boot, often by setting "OS type" to "Windows UEFI mode" and Secure Boot mode to "Standard."
6. Save the changes and exit BIOS (usually by pressing F10), then let your computer restart.
7. Verify Secure Boot is enabled by checking the system information again.

Note that the exact BIOS menus and naming conventions vary between manufacturers, so referring to the specific support documents or manuals for your motherboard or system might be necessary.

Would a more specific guide be preferred based on a particular PC brand or motherboard?