To shorten boot up time, fast boot feature does not allow [DEL] key to enter BIOS during POST.
You may follow the procedure below to enter BIOS setting:

1. Open Charm Bar and click [Setting] (keyboard: [Windows] key + [I]).
   
   


2. Click [Power] then you will see [Restart]. Press [Shift] + [Restart] simultaneously.
   
   


3. Now you will see a "Choose an option" screen. Choose [Troubleshoot].
   
   


4. Click on [Advanced options].
   
   


5. Choose [UEFI Firmware Settings].
   
   


6. Click [Restart] then computer will automatically enter BIOS setting.