Please add more info about your system, as detailed in https://retropie.org.uk/forum/topic/3/read-this-first.
The system won't take the BIOSes also when I put in games it only accepts the .cue files.
Yes, EmulationStation doesn't list the .bin file, though the game needs them. So if you copied just the .cue files, that's not going to work. A CD image has both a .cue and - at least - a .bin file.
What are the names of the BIOS files and where did you copy them ?
Does PCSX no longer work? Can anyone help me? I'm new to this so please explain to me in easy ways
pcsx-rearmed is not compatible with the Pi4. I suggest to start with the Gettig started page from the [Docs][https://retropie.org.uk/docs/] to familiarize yourself with RetroPie, then take a look at the PS1 page from the same docs, to check if your BIOS files are named correctly.