Apologies for the oversight...I tend not to read everything in a post, which is just a sloppy mental habit of mine.
Every BIOS on every system...can theoretically be different. So I can't provide any standard instructions on how to configure your system. But your owner's manual for either your system or your motherboard...should explain all this.
System manufacturer and model? If custom-built system...motherboard manufacturer and model?
General info: How to access-enter Motherboard BIOS - http://www.michaelstevenstech.com/bios_manufacturer.htm