Cut two holes on top of the question mark for the string to hang it. Then cut two holes on the bottom to hang the dot. Make two corresponding holes in the top of the dot so it can be attached to the bottom of the question mark. The further apart you make the holes for the dot, the less it will move and turn.
Bring the string through the holes at the top and secure it with a square knot. Run the string through all four holes (two at the bottom of the question mark and two on the dot). Measure out the length you want the dot to hang. We used about eight inches of string, and it hangs about three inches below the question mark. Tie a square knot in the string to make it a circle.
Cutting fringes into the party streamers is the most time consuming step. To fringe, just cut slits halfway up the streamer every half inch or so. If you fold the streamers a few times, you can make multiple layers and cut through more at once.