1.Fold it in half lengthwise. 2.Do it again. 3.Open it back up. 4.Make the edges meet at the middle. 5.Fold it in half lengthwise. 6.Fold in half width-wise. 7.Open it back up (not all the way). 8.Make the edges meet in the middle. 9.Fold it back in half width-wise. 10.Finished unit. 11.Make 2 of them.