Stap 1:
Prefold over these lines, then turn
the paper.

Done!

Stap 8:
Press/push these edges downwards/flat

Stap 6:
Unfold the folds of step 5

Stap 13:
Fold the 4 large flaps to the inside of the model
too.

Stap 12:
Mountain-fold the triangular flap to the
inside. Do the same with the other three
flaps.

Stap 11:
Open the model, see arrow

Stap 10:
Repeat steps 4 to 9 on the other three flaps,
see pink arrows.

Stap 9:
Valley-fold the triangular flap downwards.

Stap 5:
Valley-fold over these 2 lines.

Stap 7:
Valley-fold the edge indicated by the arrow
upwards.

Stap 3:
Fold this flap upwards.

Stap 2:
First valley-fold over the 2 lines at the
bottom right. Then mountain-fold over the
2 diagonal lines in the middle.
And valley-fold over the 2 lines at the top left.

Stap 4:
Squash fold the flap, see pink arrow.

Stap 15:
Prefold over these 8 lines.

Stap 14:
Turn the model.

Stap 16:
Pull the tip indicated by the pink arrow upwards
by making an inside reverse fold over these
3 lines.

Stap 17:
Close the umbrella by folding over these
16 prefolded lines.
Then roll up/curl the tip of the flap, see arrow.