Run a crochet hook through the part of the side of the rug you wish to place the tassel. Use the hook to grab the center of the folded twine and pull through so that you have a loop sticking out of the top of your rug. Grab the loose ends of the twine and pull through the loop. Pull to tighten and form the tassel. It might be necessary to pull on individual pieces of twine to tighten any obvious bulges.