Place both sides parallel on saw horses (3 are needed) with the bottom edges up. Bring hull sides together on one end aligning the edges and forming a point. At this point the other ends will be spread very wide, thus the need for 3 horses.
The instructions provided on this website are not always detailed enough and are "my way" of doing things. Ask 10 different boat builders or woodworkers how to do 1 thing and you'll get 10 different answers.