Open Settings
Go to System
Click Recovery
Under Advanced startup, click Restart now
On the Choose an option screen, select Troubleshoot
Select Advanced options
Select UEFI Firmware Settings
Click Restart
Enter BIOS/UEFI setup
Alternatively, restart the PC
Press the BIOS key repeatedly during startup
Common BIOS keys: Del, F2, F10, F12, Esc
The exact key depends on the PC manufacturer