Right on the first interface after booting, repeatedly press "F2" (most common)/Del/Insert/F10 to access BIOS.
Remark: (What if I keep on failing to access BIOS because the startup happens too fast?)
Remark: Different motherboard models may use different names for the term VT, some of the common ones include:
"Intel(R) Virtualization Technology", "Virtual", "Virtualization", "VT-X", and "SVM".