Hello!
When you come to Step 7 you will notice that as you raise the triangle
the sides at the base of the triangle will naturally begin to "cup."
Gently pull on the triangle until these cups form at the sides allowing
you to fold the tip of the triangle over. Flip the model over and
reinforce the small triangular fold. Step 7 is what give this model
it's shape.
This model is a variation of Akira Yoshizawa's : Butterly. Any
reference to his model will show this step.
Hope this helps!
Rosemary Browne
B.C. Canada