Hi Ellen, if you have our parchment paper sheets, these sheets measure 16½" x 12¼." I would start by folding one of the short sides over so it lines up perfectly with the long side, forming a triangle where the two sides of the triangle that are equal are 12¼" and the long side is about 16½." If you cut off the remaining strip of parchement paper and open up your triangle you should have a nice square, which you can cut in half to make two cornets. The part that I found a bit tricky in the directions was this:

To make a cone shape, take the two corners at the bottom of the triangle and roll them into the center to form a cone shape. The “tip” will be at the center of the long end (hypotenuse) of the triangle. You’re going to have one corner on the inside and one on the outside, but that straight line where you cut should roughly meet up in the back.

It helped me to realize that the two corners that are folding inward need to overlap and meet up in the back, with one corner on the inside and one on the outside. This is a tighter cone than I originally imagined, but once I figured this out, then it all came together and made sense. 

I hope this helps! 

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