Fold your paper in half vertically. Then unfold.
For the top half, fold the left corner to the line in the middle. On the bottom half, take the right corner and fold it to the middle line. DO NOT unfold.
Then fold the unfolded space and half on the top and bottom halves. Then turn it so it looks like the last picture.
After that fold the right corner up to the middle and you will see a tiny triangle. Put the corner under the triangle. Do the same thing to the other side.
Step 5: Finished
Ta-da!!! Now you have finished making the origami envelope!!!