Gigabyte GA-K8NS-939 User Manual page 31

Set Supervisor Password
Change, set, or disable password. It allows you to limit access to the system and Setup, or just to Setup.
Set User Password
Change, set, or disable password. It allows you to limit access to the system.
Save & Exit Setup
Save CMOS value settings to CMOS and exit setup.
Exit Without Saving
Abandon all CMOS value changes and exit setup.
- 31 - BIOS Setup