Step 1:
Prefold in half over these two lines.

Step 8:
Prefold, the upper line lays in the middle of two already prefolded lines.
Open the model afterwards, see arrow.

Step 6:
Fold the corner to the left, all lines are prefolded.

Step 11:
Fold over these two lines. The lower line lays just a little below a prefolded line, see arrow on the right.

Step 10:
Close the model again, see arrow.

Step 9:
Fold over the prefolded lines.

Step 5:
Prefold, use the prefolded lines as guidance.
Then open the model, see arrow.

Step 7:
The upper and lower edge are parallel to each other, see arrows.
Fold over the dotted line.

Step 3:
Fold the edges to the centerline and unfold the model afterwards.

Step 2:
Fold the edges to the prefolded centerline.

Step 4:
Fold over this line.

Step 12:
Unfold the folds of step 11 and open the model, see arrow.

Step 13:
Fold over the prefolded lines, press the part indicated by the arrow firmly downwards.

Step 14:
Close the model again and fold the layers on the bottom of the boat together, see photo below:

The yacht in the left photo is folded out of a white paper and the one in the photo on the right is folded out of a newspaper magazine.

Fold over these two lines....  Done!

This is a video tutorial for folding the yacht: