How do I setup Secure Boot

Hello..... I have Inspiron 14r 5420 ( with windows 8) . Since it was giving too much of problem I reformatted my laptop and reinstall windows using a new original windows 8 CD. Nowedays whenever I set my computer to perform secure boot, it does not boot and it shows the boot menu ( the screen shows some options like the one whenever you tap F12 when the BIOS is loading ).

I can either boot :

1) Legacy Boot                             : enable

    UEFI Boot / secure Boot         : disable

2)UEFI Boot                                  : enable

    Legacy Boot / secure boot     : disable

    Load Legacy Rom                   : enable 

My BIOS version is A16

This the link where I download the BIOS : http://www.dell.com/support/drivers/my/en/mydhs1/DriverDetails/Product/inspiron-14r-5420?driverId=MFC3R&osCode=W864&fileId=3177644689&languageCode=EN&categoryId=BI

Driver page of my laptop : http://www.dell.com/support/drivers/my/en/mydhs1/Product/inspiron-14r-5420

My question is how do I setup / configure the UEFI Firmware, EFI  or secure boot in my laptop so that my laptop can boot in secure boot