huh?

ive played Cards Against Humanity many times and know the game well, but i cant for the life of me figure out what im supposed to do with this app. The "instructions" provided are for the card game, but dont tell anything about how one uses this app. is it an online thing? does one pass a single device around? and if the latter...oh, never mind. its too confusing for me to even figure out what questions to ask.

plaintiger about Card Decks for Cards Against Humanity, v1.1