push the material down over the roller in the bottom half when its open.It makes a little pocket for the weed to go in, then put the paper in the back of the pocket(after you like the sticky)then close the box, itll shoot out the top slot, a nice J that is

hope that helps..if not sorry, maybe someone else can explain it a little more clearly,see i just rolled it on my own, and smoked it, before i posted...lollol