Fold paper like so, bringing the corner evenly down to the opposite side.
Then, take your top corner and bring it down to the line created by your first fold.
Like so. (Looks like a house)
Then, fold your "house" shape in half.
Fold down wings with size of your choice, I do ~1 inch from the bottom.
Add a little tip at end of wings.
Put four staples in the body, and one in the front of each wing. These help to hold it together as well as weight it a little.
Experiment with different wing sizes and staple placement. I understand the design causes the weight to be lopsided, that is the point, it causes plane to do tricks when thrown hard.