knave

hi everyone simply just love the game . question is on a few some missions paying a social call and The Noblest Of Men And A Woman ,also in general when i kill npcs i cant pick up the weapons in the missions cant pick up the shotgun and the pistols . on the screen it shows L1 AND UP AND DOWN ARROWS , and when i try to do anything nothing happens , i think i must be missing something , if some nice person can help explain i be most happy even more happy if there is a you tube video explaining this .