Requesting help for PPSSPP(PSP) setup on Macbook retroarch 1.7.5

Hi everyone I am new to this forum… I am trying to load PSP roms on my retro app (Mac OS) I have Fbalpha , Mame cores loaded with no issues. I have installed the PSP core via the retro app. But I am supposed to copy some files to a folder which I did too. Yet I am getting no result from that…Anyone got any clue what could be wrong or if I am missing a step or two… Thanks in advance…