This is a simple and safe plane that anyone can make.
Step 1: Finding the center
Fold in half (corner A to D), then fold opposite corners together (corner B to C) to find the center (just pinch it there). This is important for getting the plane square.
Step 2: First edge
Image 3: Fold corner A to the center. This is very important to insure symmetry and thus no whacky flight paths.
Step 3: Series of folds
Images 4 & 5: Fold edge 1 to the center, followed by edge 2 and edge 3.
Step 4: Forming the triangle
Image 6: Bend the folded section onto the other half of the paper, forming a triangle.
Step 5: Popes hat
Image 7: Bend corners B & C together forming a circle and tuck one end into the other. It should look something like a Pope hat. Use glue or tape or a staple to keep the corners together.
It's easiest to throw when held as shown in image 7. A slow pitch works better than a knuckle ball hurl so go easy. The curved edges of the tail can be bent for trim, which is likely necessary. On a calm day it will go as far as you care to walk after it. Or don't, you can make 10 for less than the cost of a cold root beer. Happy folding!