sorry if you cant under stand some of the steps it wouldn't let me add any notes.
Step 1: 1
First cut of th sides on the red lines,next cut off the top.
save the side that has no holes.
Step 2: 2
then fold the bottom edge up to meet the top.
next fold the bottom to meet the angled edge.
keep folding it like that.
fold the flap into the pocket.
Step 3: 3
fold the outside edges to meet the inside line.
tape the edges together,then cut off the end to make it flush.
Step 4: 4
it should look like the picture
draw a fin on your paper so there all uniform,and cut it out.
fold the fins in half length wise then unfold .
tape the bottom part of the fold on the body as straight as possible.
Step 5: 5
you can add some weight to the tip but it doesn't make that much of a difference .
now go throw it, it flys better if you throw it at a upwards angle.
go have fun and don't throw it at the face its pointy.