I can't write ingame in pc

hello, I have a problem when I want to write something ingame, that is that I load my core, that is ppsspp, then I load patapon 3, and when I press continue, I don’t see anything, only a black screen. And when I selected a save data and I have to write my name, I can’t. Can someone tell me why?

do you have the ppsspp assets installed?

I think I didn’t do that, can you help me with that?

I don’t know if I have it installed

this page has the steps: https://docs.libretro.com/library/ppsspp/#bios

thank you very much, I think it will now work