What you do:
1. Print the template directly onto a piece of card stock.
2. Cut out the shape along the solid lines.
3. Fold and crease well along the dotted lines.
4. Put glue on the top half of the top flap (where the word glue is in this picture). I used Elmer's Dot Runner (for the first time) and I am hooked. It was so easy to use and was perfect for this kind of paper craft. I would definitely recommend it. Otherwise, I would recommend using double sided tape or possibly a glue stick or even a small dab with a hot glue gun. Regular Elmer's glue or tacky glue would take too long to dry for this project and could crinkle the paper.
5. Fold the top flap up and over the extra flap and secure.