Step 1:
The other side of this pink paper is white.
Fold in three parts of the same size.

Step 8:
Fold both parts in half.

Step 6:
Press flat, do the same on the other side.

Step 11:
The line on the right is a little off the edge.

Step 10:
Fold both parts in half

Step 9:
Press / fold the model flat again.

Step 5:
Fold both flaps backwards, see arrows.

Step 7:
Turn the model

Step 3:
Fold over the prefolded lines.

Step 2:
Fold in half and unfold the model.

Step 4:
Prefold over the two pink lines and use them as guidance for the folds over the purple lines.

Step 12:
Fold the upper edge to the same height as the lower edge, see arrows. Use tape or glue.

Step 13:
Fold the chair legs in half.

Pictures:
Origami dollhouse furniture

Done!
This is an Origami video tutorial for folding the chair: