This will tutorial will show you how to make enough garlands to decorate one 6-7ft Christmas tree.
Thread the needle through one of the button holes, and then pull it through the other direction until you can stick the needle between the 2 threads at the knot to connect it. Knot the thread into place.
(The buttons are necessary to prevent the thread from pulling through the popcorn and causing the whole strand to fall apart.)
Push the threaded needle through popcorn pieces, one at a time, until you have a long strand. When you have 4-6" left on your strand, thread another button onto the end, and knot it into place. Cut the string, and voila! There is one completed garland!