To enable Secure Boot in BIOS, the general steps are:

1. Power on or restart the computer and enter the BIOS setup. This is usually done by pressing a key such as F2, Delete, or Esc immediately after powering on.
2. In BIOS, enter the Advanced Mode if the BIOS opens in Easy Mode (often by pressing F7).
3. Navigate to the Security tab or the Boot tab, depending on BIOS layout.
4. Find the Secure Boot option and select it.
5. Change Secure Boot Control or Secure Boot state to "Enabled" or set OS Type to "Windows UEFI mode" to activate Secure Boot.
6. Save changes and exit BIOS (usually by pressing F10).

Some BIOS may also require disabling Compatibility Support Module (CSM) and ensuring the system is booting in UEFI mode for Secure Boot to be enabled. After rebooting, check in the operating system to confirm Secure Boot is enabled. These steps can vary slightly depending on the computer or motherboard manufacturer and BIOS version, but the core process is similar.

If a detailed step-by-step guide specifically for a certain manufacturer or model is needed, that can be provided.