How do I get into the BIOS of my Toshiba PC?

I would like to update my Toshiba Satellite C855D-150 laptop from Windows 8.1 to Windows 10. That's why I now have the Windows 10 version on my USB stick - when the laptop is started, the USB stick is already in the PC, but now it gets stuck on the start screen "Toshiba Leading Innovation". Also with F12, F8 and Escape I can't get any further 😪

Tried F2?

So I would remove the USB stick. Now switch on the laptop and immediately hold down the F2 key (it may also be the case that the key is pressed several times in succession

must be operated). Now you should get into the BIOS. Now only the

Change the boot order (booting from the USB drive must be first).