Step 1:
The Origami paper is made of two squares glued together. One side is a little darker than the other side.
Prefold in half, then fold the right edge to the centerline.

Step 6:
Prefold over both lines

Step 5:
Fold the upper layer in half on both edges.

Step 2:
Fold over these two lines. The left line is the prefolded centerline.

Step 4:
Press flat, see arrows.

Step 3:
This is the other side of the model.
Fold over these two lines.

Step 10:
Fold into a straight angle

Step 8:
Prefold over these lines.

Step 9:
Fold / pull both edges straight upwards.

Step 7:
(Pre)fold over this line and roll up the right part. Use tape or glue.

Step 16:
Fold each corner downwards.
Repeat steps 15 and 16 on the other side.

Step 15:
Press the edge inwards from all angles, see arrows.

Step 12:
Fold over this white prefolded line

Step 11:
Fold over these two white prefolded lines.

Step 14:
Press the edge to the right, use glue or tape.

Step 13:
And fold over this white prefolded line.