You have to start with a square piece of tissue paper. Fold it from corner to corner (so it is a triangle) then do it again to make a smaller triangle and then a couple more times to make an even smaller triangle. Then you start cutting little designs out all the way around it. If you want a lot of design you should cut a lot of small notches, zig zags, triangles, half circles, stuff like that.
I hope this explains it. Just try it a couple of times to see what looks best.