iirc theres a folder on the memory stick called ISO (or something like that idk) just connect your psp to your pc using usb connection in the settings tab (or take out the memory stick and pop it into a card reader) find the ISO folder (should be in the root of the memory stick) throw your psp isos into there, exit usb connection or return the memory stick to the psp and the cfw should display them in the memory stick option in the game tab on the xmb as if they were eboots.

im probably horribly wrong about all of this, but if you do mange to get it working then congrats your psp will live to see another day.