Open Start, click the power icon, and click Restart.  If your computer is locked, click the lock screen, then click the power icon in the bottom-right corner of the screen and click Restart. If your computer is already off, press your computer's "On" switch. Once the startup screen appears, you'll have a very limited window in which you can press the setup key.  It's best to start pressing the setup key as soon as the computer begins to restart. If you see "Press [key] to enter setup" or something similar flash across the bottom of the screen and then disappear, you'll need to restart and try again. The key you're prompted to press might also be different; if so, use that key instead.  You'll typically use the "F" keys to access the BIOS. These are at the top of your keyboard, though you may have to locate and hold the Fn key while pressing the proper "F" key. You can look at your computer model's manual or online support page to confirm your computer's BIOS key. After successfully hitting the setup key, the BIOS will load. This should only take a few moments. When the loading is complete, you will be taken to the BIOS settings menu.

TL;DR in Indonesian:
Jalankan ulang komputer. Tunggulah hingga halaman pembuka komputer ditampilkan. Tekan dan tahan tombol Del atau F2 untuk masuk ke halaman pengelolaan komputer. Tunggulah hingga halaman BIOS dimuat.