how to enable the f2 and f12 keys

"I am trying to install Windows 11 on my Acer laptop without a USB drive. During the installation process, the rEFInd boot management screen does not appear. To access the BIOS settings and prioritize rEFInd as the primary boot option, I have to restart the computer and repeatedly press the F2 or F12 keys. However, despite installing both rEFInd and GRUB, and running numerous commands in the terminal, rEFInd still refuses to show up on my screen