Take your time to make sure the edges are lined up when you fold your paper. If you crease the paper and the edges are misaligned, your spaceship may not fold together as easily.
The edge that you folded over should form a straight line on the bottom of the triangle.
If the creases aren’t visible, try folding the paper again and press down harder along the edges.
If you have trouble pinching the sides in, fold the top edge of the paper so the crease goes through the center of the X. Unfold the paper and try pinching it again.
Don’t fold over the corners of the other triangle.
If the fold doesn’t want to stay after you press with your finger, try going over it again with your thumbnail or the side of a pen to flatten it.
These folds will look like windows on your spaceship’s cockpit.
You can also keep the wings straight if you want.
