Wiltshire12345 shows you how to use your PSP as a game controller. You must first download FuSa game-pad onto your PSP Once you download the necessary link you go to usb charge and hook up your usb so it doesn't die as you play. Fun the FuSa game pad and
If you are on iOS 12 or below: my recommendation is to download PPSSPP on a computer, then transfer it to a File Explorer app, such asUSB Disk Pro(It’s a paid software, but I download it when it was free. You can always opt for other free alternative)...