The ASRock BIOS/UEFI is fairly intuitive. The idea of UEFI is to be able to navigate with a mouse and keyboard, making navigation and changing options substantially easier than it was with older BIOS versions. My mouse wouldn’t work at all in the UEFI, but I’m sure if you also encounter this problem you’ll be able to use the arrow keys on your keyboard as well as the “enter” key to change options without any issue.
The UEFI is divided into 6 sections:
Main, an overview of the system.
OC Tweaker, allowing you to change all settings related to the overclockable parts of your hardware. There’s also an option to save your settings as a UEFI profile to load with ease. This is a nice feature for people always wanting to get the extra mhz from their processor. Save a stable profile, then use a different one to push further. Definitely saves you time writing down BIOS settings should something go awry.
Advanced, allowing you to change advanced system settings such as C-States and Intel chipset technologies. This is also where you’d update your UEFI to a newer version.
H/W Monitor is exactly what it says; it monitors your hardware, gives you temperature and voltage readouts. Here you can set fan speeds and temperature targets if you’re using PWM, too.
Boot, where you can change your boot order and options.
Security, where you can change security settings such passwords for the BIOS.
Then finally, an exit tab, allowing you to easily save or discard your changes.