BIOS is not a windows application. The BIOS is a function of your motherboard, and on most computers, all you have to do is press the Delete key to access it.
When you start your computer, before you get to the Loading windows screen, you will either see a logo of some sort, or some text. Somewhere on the screen it will (hopefully) have something telling you which key to press to access you're BIOS. It is before Windows starts that you have to press this key, once you see that windows loading screen, you will need to reboot your computer if you want to access the BIOS.
If you don't see a screen telling you which key goes into BIOS (or it may be called Setup), first try Delete, then try the F1-F12 keys, as they can commonly get you into the BIOS as well.
But whatever you do, be careful in there, a wrong setting can make your computer unbootable.