How do you update your bios???(please help!)

My specs:

1 x Case (NZXT Tempest 410 Gaming Case - Black))
1 x Processor (AMD FX-8150 CPU (8x 3.60GHz/8MB L2 Cache)))
1 x Motherboard (Gigabyte GA-970A-D3 -- AMD 970))
1 x Memory (16 GB [4 GB X4] DDR3-1600 Memory Module - Corsair or Major Brand))
1 x Video Card (AMD Radeon HD 7770 - 1GB - Single Card))
1 x Case Lighting (None))
1 x Power Supply (700 Watt - Standard))
1 x Processor Cooling (Liquid CPU Cooling System [AMD] - ARC Dual Silent High Performance Fan Upgrade (Push-Pull Airflow)))
1 x Video Card Brand (Major Brand Powered by AMD or NVIDIA))
1 x Primary Hard Drive (2 TB HARD DRIVE -- 64M Cache, 7200rpm, 6.0Gb/s - Single Drive))
1 x Data Hard Drive (None))
1 x 2nd Optical Drive (None))
1 x Optical Drive (24X Dual Format/Double Layer DVD±R/±RW + CD-R/RW Drive - Black))
1 x Sound Card (3D Premium Surround Sound Onboard))
1 x Speaker System (iBUYPOWER 2.1 Channel Stereo Super Bass Subwoofer Speaker System))
1 x Network Card (Onboard LAN Network (Gb or 10/100)))
1 x Monitor (None))
1 x Keyboard (iBUYPOWER USB Keyboard))
1 x Mouse (iBUYPOWER Internet Mouse))
1 x Operating System (Microsoft Windows 7 Home Premium + Office Starter 2010 (Includes basic versions of Word and Excel) - 64-Bit))
1 x Warranty (3 Year Standard Warranty Service))
1 x Rush Service (Rush Service Fee (not shipping fee) - No Rush Service, Estimate Ship Out in 5~10 Business Days))
1 x Video Camera (None))
1 x Meter Display (None))
1 x Flash Media Reader / Writer (12-In-1 Internal Flash Media Card Reader/Writer - Black))
1 x 2nd Monitor (None))
1 x Free Stuff ([Free Game Download] - DiRT3 - Free with purchase of AMD FX / A-Series processor))
1 x iBUYPOWER Labs - Noise Reduction (None))
1 x iBUYPOWER Labs - Internal Expansion (None))
1 x Motherboard USB / SATA Interface (Motherboard default USB / SATA Interface))
1 x USB Expansion (None))
1 x Case Engraving Service (None))

So i have no idea how to update my bios, Can someone help me?