1 y - Translate

Just got a diaper cover from rearz and this diaper novice isn't sure if he's using it right. I thought you just wore it on top of your diaper and attach the velcro but then there's snap buttons that I have no idea what to do with, as well as a pocket on the inside? I'm guessing a booster pad could fit on the pocket but what about the snap buttons? Am I just an idiot?