Start with a strip of paper or ribbon.
Tie a knot at the top as shown.
Flatten the knot.
Tuck the loose end into the pocket of the knot.
Fold the long leftover strip along the edge of the pentagon shape.
Again fold the loose strip along the pentagon.
Keep folding along the edge to wrap the strip around and around the pentagon until there's only a short strip left.
Tuck the loose end into the pocket.
Use your fingernail to carefully poke in the sides of the pentagon so that the star will puff up.
Once your done with all the sides you now have an origami lucky star.