Use the line as a guide for making the holes in your box. If you have a long reach hole punch, you should be able to punch the holes about 1" apart. Without a long reach hole punch, you will need to use sharp pointed scissors or an ice pick to make holes along the line. If you use an ice pick, you will have to push a ball point pen or other round object through the hole to make it large enough for the ribbon.
Poke or punch one hole on each end of the shoe box either with you long reach hole punch or scissors. The hole should be at or near the center. Measure your dowel or skewer to fit through the holes to reach each end of the box and stick out a bit. If you are using a bamboo skewer, you will need to cut off the point on the skewer. This can be done easily with wire cutters. If you are using a thicker dowel, you may need a saw.