Download epsxe from appstore.
Download 7zipper from appstore
Download bios from https://romsmania.cc/bios/psx-playstation-bios-scph1001-bin-1
Use 7zipper on the bios they will most likely be in the download file.
Go onto the epsxe app and click run bios find the file that 7zipper unziped and unzip it.
Now you need to download the game last site I used that worked was https://www.retrostic.com/roms/ps-1
After that click run game on the epsxe app and find the game you may need to use 7zipper on the game first if it is not a iso. file.