Select UEFI Firmware Settings and your machine will boot into the BIOS. The BIOS looks different depending on your motherboard manufacturer.

You can check where to find the CPU settings by looking on your manufacturer’s homepage (common manufacturers are Asus, MSI, ASRock, Intel, …). You can get information about your motherboard by running this command in PowerShell:
wmic baseboard get product,Manufacturer,version,serialnumber

Motherboard information output for an MSI motherboard

The CPU settings can probably be found under ProcessorChipset or Northbridge.
The setting to enable virtualization may be called VT-xAMD-VSVM, or Vanderpool. Enable Intel VT-d or AMD IOMMU if the options are available.

After enabling virtualization, you can save and reboot.

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