It's very easy to setup the textures file but if you are doing it first time, It might be hard for you to do this, all you have to do it just create a new folder named "TEXTURES" in your psp file in your sdcard/internal storage and then move all the textures file of tekken 7 in that "TEXTURES" folder which you have created. If you still didn't understand, don't worry, here is the tutorial video, watch it.